That is fine. Most of us are not demanding player models be ripped out if what you have is tweaked. Most of us know it may never be done in that fashion because of animations. And a lot of us are mostly happy with how things look year to year just for the model itself. Seems things are improving every year as you alluded to....
But stuff like the templates on jerseys? Yeah, not sure what would be preventing this from being changed or modded in. Inaccurate representation of the classic MLB jersey is not something I think most people want in a sports game of this stature. It just seems like a mistake made so long ago that no one wants to correct.