i have to both agree and disagree.
I think a score is useful for people starting out, because they can use it to figure out what *should* be done.
on another hand, like you said, people try to get the best score, and ignore logic.
i think they should show the point gain, but not the points. the points should not be shown until post game, and they should help determine an IP gain.
but! if it does determine an IP gain, nothing of score should be shown until post game, not even point gain.
but i do mostly agree with the OP