To me it never made sense to start the best players one game, only to bench them for another - just for the sake of gameshape.
I agree this make no sene compare to IRL basketball, where teams consistently field their best players almost every games.
However from a gameplay perspective, it is meaningful, forcing managers to make tough decisions, especially for teams that go far in the tournament, managing three difficult games a week is really challenging. Indeed I think it is one of the core element of the gameplay.
On the other hand GDP, neither make sense as far as RL basketball is concerned, nor from a decision making point of view.
As, in many cases, the choices will be pretty obvious. If you play a team with a dominant tactic or a dominant player, choose the orientation accordingly. You'll gain something either by making the good prediction or by enticing the opponent to an inferior tactic. If the opponent doesn't have an obvious strength just play as usual with no GDP, and man to man.