Of course it can be changed or let's say, it could be changed. But apparently everybody else but you think that the current method is a better one.
that is not a reason why it cant be changed.
The longer the game evolves, the better the height factor in training will be visible. Almost all the best centers in BB will be big guys.Sure, there will be some smaller players who 'll have a great rebounding stat, but they won't reach the ultimate BB-top in the long run.A bit of patience and you should be fine.