I find it really redundant to repose my skeleton mesh every time. It’s a waste of time especially when people like me, non animator, that isn’t going to add any custom animation to it. But still we have to repose every single mesh that I bought to match the A-POSE or T-POSE. If you forced the animators to match the A-POSE at least force the mesh characters to match the A-POSE as well. Quality is very important to many of us and “you may be able to fix this” isn’t what we want.
I really like the idea of an auto T-POSE as mention above. That should solve everyone problems.