Optimizing
There is out of play optimizing - and let's admit that monks need help - and in play optimizing.
Taking classes and feats to improve your effectiveness is done on your own time & actually allows you to enjoy D&D while not playing. You can research & contemplate your choices.
Taking up game time with a calculator figuring out whether against AC 28 with a +14 attack, you are better Power Attacking for 2 or 3 just takes me right out of the moment.
I am not saying either thing is "bad" or "good" in general. I am just saying that, for me, this is what maximizes my enjoyment of the game.