["I was fortunate enough to somehow have developed enough technique through just the literature to have never owned a copy of Hanon, Czerny or any other 'opus' of 'finger' exercises. However, I definitely believe that scales and arpeggios are a refining tool that not ONLY build strength and agility, but also add to one's musical vocabulary. I cannot read through any Beethoven or Mozart Sonata without numerous passages in which scales and arpeggios have already paved the way."]
Thank you for stating what the late Earl Wild, stated in his Memoir.
That is (using my philosopher side), inductively, piano literature pieces contain scale passages and also arpeggios. Therefore it follows: that when we separate these particular compositional devices into separate exercises, then it follows: this improves a particular pianists technique.
Earl Wild says no, and so do I.
For the record, Dorothy Taubman, Edna Golandsky, nor Dr. Thomas Mark, had not nor have not had anything to do with Hanon exercises or anyone else's'. Their pedagogically thesis/science is based on the writings of Tobias Matthay and also the Alexander's (whole body) technique.
Further, I will break it down to a level most of you can understand, which will sound demeaning. Instead, it is directed towards your so-called expert teachers, who are teaching/talking down to you as follows:
If want to learn how to use a hammer (old school) or a mechanical hammer/nail gun, then I just need to get a set of blocks and then practice that technique. And, initially, that is the way this is taught.
However, the best way (with carpentry, or the piano) is to practice and learn skills on the job which specifically apply to the skill task at hand.
Piano exercises are garbage, and no one can produce any Kinesiologist in the world who can present a shred of empirical evidence that directly shows that any piano exercise produces effective or improve piano technique.