This thought occurred to me while playing CP2077, but it's prevalent in a TON of games - instant kills by sneaking up behind enemies.
I usually play stealthy if given the option, I find it more fun than just wading through people in an ocean of blood, but this mechanic is almost game breaking in most places it appears. No matter how outgunned you are, all you have to do is wait til the enemy NPCs backs are turned for an instant, low-risk kill. Sure, some games make you grab them first before the kill, leaving a slight window where you can be spotted by another enemy or whatever, but with the tiniest modicum of planning that risk is almost nil.
In the case of CP2077, the stealth kill is available right from the start as well, so for someone like me who likes to play the stealthy way, there's barely any reason to spec into any other shit (except for the abilities which make it easier for me to sneak around dudes for the instant kill, lol).
If instant stealth kills weren't a thing, there'd be much more challenge in trying to ACTUALLY be stealthy, i.e. sneaking around enemies without killing/incapacitating them, completing your objective, then sneaking back out unseen. Of course, there are some games that reward this playstyle (MGS for example). But plenty of other games (including '77, not trying to dunk on it exclusively it's just freshest in my mind) will give you bonus rewards for "not leaving a trace behind" (i.e. not having a combat alert) when you've actually left a trail of snapped necks.
I don't really know what I'd like to see instead - I guess games where there's better application of stealth are usually ones that are designed with the stealthy playstyle from the ground up (the Arkham series, MGS). And I appreciate they're trying to give you a reward for creeping up on people, but like I said, it's almost game breaking with its effectiveness in most games. What do y'all think?
I saw a pretty good implementation of this mechanic recently in Partisans 1941. In the game, you can perform knife kills, but the success of that kill depends on the melee skill of the character. So if I were to sneak a partisan with only 1 melee skill and try to stab a Wehrmacht officer, then the officer would win the fight. Also, the knife attack always produces a loud struggle, so even if you kill an enemy and win, the noise might have caught the suspicions of others. I feel like it's pretty well done, no attack is without risk, and extra planning has to done to not get caught and killed.