I wanted to add that a need for an overhaul doesn't necessarily mean a person is doing everything wrong, in fact, it can be that there are many things that are right, with the exception of one essential ingredient: A proper foundation. And, when I say proper, all I mean is basically one which can and will support everything you're doing right in a way that will help you reach a higher potential, vs. work against you. It's amazing what having something fundamental out of place or missing can do to a lot of other things being there and in place, it makes it nearly so that no matter what else you have going for you doesn't really matter or truly amount to much.
I had one quite talented student who would be a perfect candidate for an overhaul on a fundamental level, I believe. However, s/he lacks discipline and a desire to work, and s/he really doesn't have ambitions to do much besides play certain styles of pieces that s/he enjoys. There is a lot that s/he does which is right and good and functional, but there is something essential missing at the foundation and without that, I believe there will always be a certain limit or kind of handicap on what can be achieved (as well as a certain level of unfulfillment, btw). As a teacher, I would never enter a certain road of tearing down and rebuilding for my sake, with somebody who I can clearly see doesn't want that. With this particular person, I wonder if one day something will become clear to them and s/he'll more or less wake up and need a new path, but maybe not, and in that case there is only so much that a teacher can say or do.
In my case, I have been deeply seeking that foundation physically, intellectually, spiritually, musically, pianistically. I could feel something was wrong, and I'm still growing now of course, but I can generally feel my pianistic expression at least "sitting" upon something now.