1) Being an Scott Robertson's cultist, if you choose this road - you'll be a master of perspective and that's means - you'll can draw anything you want from imagination, you'll be a master of box. Famous cultists - Kim Jung Gi and his followers, ModernDayJames.
2) Being an traditional Watts Atelierist or Villpu, pros - masters of gesture, cons - can't draw anything without reference, can't draw with graphics tablets because they'll use overhand grip. Famous cultists - Proko and of course a lot more.