I'm trying to keep my sense of humor here.

Minimalism, as everyone here would agree, is inherently reductionist in nature. Originally, it was a reaction to aleatory composition (which I call chance music), around which it became too difficult for most listeners to wrap their minds. So minimalism was a reaction (perhaps an over-reaction in my humble opinion) which brought simplification to music--i.e., use of musical fragments (or germ motifs as we used to say in Theory 101), simple straightforward harmonies, and--to make sure listeners "got it"--incredible amounts of repetition! So while much music prior to the minimalist movement featured contrast (although chance music probably went off the deep end with contrast), minimalism pushed the pendulum over to repetition a la Philip Glass. What was missing was balance. If one looks back to Baroque, Viennese Classicism, Romanticism, Late Romanticism or Impressionism, for example, there was indeed a thoughtful balance in composition between contrast and repetition. For me, that helped make the music of those periods so enjoyable and listenable. That same balance afforded complexity without being complexity of the opaque and abstruse kind.
After being a member of this forum for a number of years, I believe that most people know that I have a dry sense of humor. My "Om" comment was meant purely in that vein. Folks might need to lighten up a bit!

Having said that, here's an interesting take I found today in Dr. F. E. Kirby's book,
Music for Piano: A Short History
(revised): "... it [minimalistic music] may over time produce a meditative, even hypnotic, effect on the listener, so that it has also been called trance music." Minimalistic music has likewise been called systemic music, process music, meditative music, hypnopompic music, and repetitive music (on that last one, I wonder why?!?). So in addition to my humor, there is some basis in fact that correlates to that "Om" observation.
As to s_bussotti's points:
You quoted me as saying "It's right to avoid minimalist composers." I kindly refer you back to my original post where I actually said, "Maybe you were right to avoid minimalism." As worded, that was a speculative possibility being posed. Maybe also goes hand-in-hand with... maybe not. That would be for pies to decide.
Yes, I am guilty of a typo in adding the "n" to Steve Reich's name. I doubt that I'm the first member to make a typo here, nevertheless, I offer my profound apologies for that!
Yes indeed, I do equate endless repetition with monotony and a lack of contrast to be uninteresting and uninspiring. Moreover, I do believe that reductionist simplification, when carried to the extreme, leads to inferior composition in the sense that it seems to be aimed at an assumed musical mind that cannot perceive, process and appreciate composition of reasonable complexity. (That's not a criticism of anyone here in this forum, so no need to seethe.) It almost seems a bit demeaning. This thinking is not new actually. Europe was still in the throws of serialism at the earliest inception of minimalism. European intellectuals at that time feared that minimalism would become the new opium of the masses. Ironically, I cannot help but wonder if, when Glass is played as elevator music, the expressed concern of those earlier European composers might have been prophetic and well founded.
Regarding composers:
I had mentioned Terry Riley, as some consider him to be the first minimalist. His "Keyboard Studies" based directly on "In C" is considered to be a landmark in the minimalist literature.
Per Norgaard wrote "Groovy" which signaled his attraction to the minimalist movement. According to Kirby, this piece "... is a kind of developmental minimalism in which figurations are constantly being adjusted, however slightly, while new pitches are added and others phased out." David Burge in
Twentieth Century Piano Music notes the repetitions in this piece, calling them the "trademark" of minimalism. This too would have to be a minimalist landmark.
Zoltan Jeny wrote "Endgame", considered by some an early "classic" of minimalism. According to Kirby, Jeny has written a number of other short piano pieces as well. Why shouldn't someone interested in minimalism look further into this composer's work?
I just checked in Hinson's Guide on Glass, and minimalist pieces for piano include "Wichita Vortex Sutra", "Five Metamorphoses", and "Mad Rush". So that choice seems well justified.
Ligeti's "Continuum" for harpsichord is considered very close to minimalism, and Ligeti himself agrees. I assume it's legitimate to play it on piano as well, as we do with Bach's music daily.
(To those I probably should have added Tom Johnson who composed "Septapede" but forgot to.)
I was remiss in recommending Steve Reich, as his "Piano Phase" is a duo-piano piece only, and I'm not aware of what minimalist pieces, if any, he might since have written for piano, and didn't have time today to research that. In any case, it would not be a bad thing, however, if pies just wanted to read a bit about him and his general contributions to the minimalist repertoire.
Obviously, I didn't mention Adams at all, as that composer was part of pies' inquiry.
Overall, although I'm admittedly far from being an expert on minimalism, I believe that my composer recommendations were certainly acceptable ones.
One thing that history shows is that the pendulum is always in motion, and once it hits its outer-most extreme, it then swings the other way. Just as serialism was far too complicated and abstract for most to appreciate, I believe that minimalism will likely wane as being deemed overly simplistic in the face of the rise of Neo-Romanticism. Ligeti already found this trend among his students while teaching, and was so struck by the post-modern attitude that he stopped composing altogether for several years. Personally, I hope that the Neo-Romantic trend continues to wax in importance as musicians and listeners alike demand more of a balance between repetition and contrast. This is just my opinion--so please chill, no need to get into a knot over it.

Having been taken "over the coals" I believe I've explained my post at length and more than adequately. I hope this will end the contention. As many know, I happen to love Late Romantic music; but if someone speaks negatively about it, calling it "film music" or whatever, to me it simply means that they have a different viewpoint and, thankfully, the freedom to express it. After all, there is very wide variance in musical tastes. So my approach to differing opinions is to "live and let live". I hope others will agree with that premise. I've talked with a couple of people off-line who read, but do not contribute to the forums here, as they do not wish to spend a lot of time defending their opinions as if on trial. I think that's sad not to have the benefit of their inputs. I image, unfortunately, that they could be just the tip of the iceberg.