I really hate whenever I try to explain how some bad rules can be abused and immediatelly get someone say shit like “If this happens in your group, change it” as if that would solve the problem. And whenever it is not soemthing you witnessed personally, then it means it never happens and could never happen.
That’s true for games in the tradition of D&D/F20/Trad, but not all ttrpgs. Fewer rules, a tighter scope and more elegant design make it much easier to rule out the kind of bad interactions or edge cases that lead to rules that run counter to the game’s purpose.
My Life with Master, Fiasco and Fall of Magic are all games i’ve played, where exploitation or abuse of rules is just not possible. Unbound is a tactical combat rpg without any room for abuse of rules.
John Harper’s rules-lite DW hack World of Dungeons is probably too elegant for abuse to be possible.
That’s the first few that I can think of, but i’m sure there are plenty more.