I think everyone should play different games now and again (go to a con!) And if they are a forever player, try running a game (do it at a con!) and if they are a forever GM they should make themselves play every once in a while (at a con!).
There is nothing worse that an insular GM who refuses to broaden their horizons and has been running the same game the same way for decades, who then tells you how perfect they are.
There is nothing worse that an insular GM who refuses to broaden their horizons and has been running the same game the same way for decades, who then tells you how perfect they are.