I'm A Banana
Potassium-Rich
Both sport and war players want to win, and they'll do whatever is most effective to do it -- war players will do it outside the box, sport players will do it inside the box, but they're both trying to be as effective as possible. Sport may allow a little more leeway because there's things that you're "not allowed" to do by the rules, just because those are the rules, but Sport also limits character options from the get-go because it doesn't allow you to go outside of the assumptions.
What enables people to choose "ineffective" combat characters is a belief that combat isn't going to be the only way that one can "win." If your Skinner Box gives you birdseed for dealing with kings or exploring hexes or changing your characters' beliefs or setting up dramatic scenes, you'll find people geared toward that.
Pretty much no one builds a character who sucks at everything on purpose. Choosing to suck at combat is mostly a way of saying "I don't want to win in combat, I want to win in other ways."
What enables people to choose "ineffective" combat characters is a belief that combat isn't going to be the only way that one can "win." If your Skinner Box gives you birdseed for dealing with kings or exploring hexes or changing your characters' beliefs or setting up dramatic scenes, you'll find people geared toward that.
Pretty much no one builds a character who sucks at everything on purpose. Choosing to suck at combat is mostly a way of saying "I don't want to win in combat, I want to win in other ways."