I don't think there's a single development path that works for every player. And since we don't have alternative realities to compare it to, this is more of a matter of opinion and hunch.
So here is my hunch: rather than force feeding minutes, the quality reps matter more. For example, Cody's development has been slowed down by physical weakness and a complete lack of self-confidence. Building strength has helped his confidence, but I also think it’s mattered that he’s had success in a very limited role, with his responsibilities growing gradually around those small wins.
In another reality, we could have played him 30 minutes a night since from the start of the season. Maybe he would be better than he is now, or maybe we would all agree that he is still the worst player in the league, as we knew at the beginning of the season. We will never know.
Another example isn’t about minutes, but about role. In another thread, you mentioned that Key is thriving with or without Nurkic. For Key’s long-term development, my hunch is that it’s beneficial for him to focus on decision-making while playing with an elite screen-setter (Nurk or Kessler), and then gradually build from there.
And as a counter point, maybe Taylor would be better if we played him 30 minutes a night. At least he can't be any worse.