The Point of Chess Is Checkmate

Teaching a very little bit of chess to my kids, they're at that stage where they're obsessed with taking the opponent's pieces, and tallying up who has how many. But at the end of the game, who has how many pieces does not factor. Only whose king got beaten.

This is an insidious example of the "wrong objective" trap, because all else equal, having more material than your opponent is good. If you lose your queen for no good reason, you're almost certainly going to lose the game. So, material is a good indicator during most of the game, and that can leave a player blind to the lurking danger: They're not calculating what would happen if the opponent sacrifices their queen, because "obviously that's bad". Until it turns out that it's the beginning move of a quick and lethal knockout punch.

Building more features faster is also something that, all else equal, seems like it shouldn't hurt. Until it turns out that it makes your product slow, clunky, unintuitive and therefore disrupted by a more nimble competitor (see Linear vs Jira).