Yeah, that's true too. Probably that wouldn't have even occurred to me, but if the board was closer to the motherboard tray because of no standoffs or too short of standoffs, then it stands to reason that with the cards mounting bracket in the correct position on the back of the case the card couldn't actually seat all the way, at least not at the back of the case anyhow. Card would be awfully cockeyed though, maybe.
Does that actually happen? Have you come across this before? Nevermind. This is TH, you probably have.