I was about to say that: in h-th it's DEFINTIELY easie r to hit someone prone when you're standing up. No debate here 🙂
I would like to see the enemies care about their life though. Like if they're severly wounder or almost dead, I'd assuem they'd at least spend one round to fall back, find some cover, maybe reach a medic. Instead they barge all-in, just to meet my overwatch. This is absolutely stupid and sort of boring.