Traditional levelers, boosters, they’re after the same thing in the end – doing content they haven’t tired of yet. The only difference is that boosters have tired of all of it except the stuff at the very end. Naturally, such different playstyles in a cooperative game will affect the experiences of other players. ‘Let others play how they want’ becomes more frustrating when it means you have fewer and fewer people who you can play with the way that you want. When your playstyle isn’t mainstream, best you can do is find the pockets of players who still subscribe to it, as in real life.