>>22398044>banlists usually try not to be overly complex so new players can jump in.This is a really good reason right here.
It's a lot easier to keep track of "X, Y and Z pokemon are banned", instead of "X is banned if using W and Y is banned with V".
Yes, the simulator can tell you when something is illegal. But the latter kind of banlist would be inherently more confusing to new players.