At Fall-In! 2019 we had some really terrific GMs, and to ensure they got to play as well as run games, we held a special GM Game on Sunday at the end of the convention. And oh what a mess we made of things!
All the things we cautioned players about all weekend: Don’t let the enemy hit your baggage train, don’t overcommit before you’ve connected with your partner, don’t assume that just because you know (or wrote) the rules you’ll be good at this! Yeah… we made those mistakes, and some more. BUT IT WAS TONS OF FUN!
Back in the day we called this “designer’s disease”. The game designer would play the game as intended, while other players would exploit the rules as written. This often led to rude awakenings.
Not sure I follow you, the “bad things” that happened weren’t attributable to “oh you can use that rule to do XYZ?!?!?” they were due to us making the same common strategic mistakes that new or average players make: Like rushing in, or not covering your flank.