dctstudio, what you are saying is undoubtedly true. Unfortunately, that's not what we were talking about.

I wrote in about the factor of HOW we play, how we are taught to play. This went beyond Hanon. But in the context of Hanon, the injuries we read about occasionally in regards to Hanon may well be related to this "how". For example, if one is taught ignorantly to keep the arms absolutely still so that the wrists are locked while hammering down with strong curved fingers while doing a repetitive action for a lengthy time, that's injury.
I am a student though I do some teaching now, and as a student in this TEACHING forum I am concerned with how things are taught and how people are guided. I came close to permanent injury the first time I had lessons, though this was not piano, and it had to do with this.
I will say that if someone does have difficulty, making excuses, as you describe, doesn't help. But finding out cause and solution, and doing something about it, does.
I will also say that I don't concern myself much with students at a high level in conservatories, "making excuses" or otherwise, because I figure that most of the teaching here is probably at a much more basic level. How many of the teachers in this forum are teaching at conservatories?