You forget the best part:
with leather you can sit down on them and they will not break...
I recommend anyone with an eva suit to replace with leather as things break and at least do the groin area in leather as it will ensure the ability to sit....
While theoretically i **could** sit down on the butt flap, I wouldn't. It won't break, but it WILL deform and I don't want that either. BUT--with the way that my lower armour is designed I can easily just lift the butt flap up slightly when i sit and there's no issue