Wise words. In the end I think that the only thing we can do is listen to our bodies, however, learning from the experience of others has great value in terms of preventing injuries.I did my gig last night and brought my own stool which was the perfect height. It was a mixed group, with some sitting and some standing, so I fit in fine.
I think at the end of the day using my stool is better for me than focusing on standing. Should I need to stand, I'll use one of my lighter accordions and make my life easier.
One big thing one can do that would be a big help, is be sure that one is in as good a physical shape as needed. Stronger legs, back and shoulders can come with a good gym routine too. if one cannot prevent the damage, one can at least try to minimize it.