Always have been, we were just baited by Oda into thinking that other crewmembers matter!
no need for a navigator and archaeologist when you can follow the voice of all things
no need for a cook when you have VP feeding machine
no need for a doctor when the said food heals you
no need for a shipwright because you'll bounce off the sea
and since you don't need a ship, there's no need for helmsman
and of course since you can do all the fighting, why would you need a combatant and a sniper
the drums are enough of the music so the musician is nice to have and not a must