Another Energy Sink
There are currently no effective answers for your benched players with too much time on their hands. You can't really sub them onto your team to burn off extra steam, and devoting a bunch of training time to them is sub-optimal. At a certain level of facilities you really run out of things for your players to do, which wouldn't be an issue except for the penalty for being at maxed out energy.
I've had a certain amount of joy watching my roster as they've progressed as players, but its really disappointing to see them effectively rot once they're no longer first string material.