If you dont make it overpowered you get situations like star wars outlaws where its too difficult and makes the game boring.
stealth games/levels suck period. its why MGS never went all in on it and with each game gave you more and more weapons to play it like rambo. MGSV is the best stealth game out there and its because they give you literally a hundred tools to make it easy and fun.
But you are overpowered in outlaws dude, if you know how to use nix, the game is a cakewalk, and ia is so fucking stupid.
When i failed Stealth in that game was because the mechanics are unreliable and random, not because it's hard or you are not overpowered.
Enemies having random sight, sometimes they spot you from afar, sometimes they can't see you from up close
The game choosing long ko animations and getting me caught instead of chosing the shorter one
Nix sometimes not working properly
Stealth takedown sometimes not working and she just punch them
Not being able to hide bodies
Cover system that is not precise so sometimes you left a shoe outside the cover and get discovered
Shit save system that doesn't save the state of the mission so you return to an area that you cleared from enemies and they are still there
Sometimes the stun hit is silent, sometimes it alert close enemies
General junkiness that make everything more cumbersome.
There is a video where 13 years old splinter cell dismantle outlaws stealth mechanics, but the game is super easy when everything work properly, nix can make you kill 3 enemies in stealth at any given time or you can just make noise and attract multiple enemies on a bush and ko them like you do in ac games, i had pile of corpses accumulating ln these bushes (when the ko animation that bring them inside the bush properly work of course) and it's rare to have more than 3 enemies super close to each other, when they are groups of 4 they usually walk around and you can totally avoid them (or you can attrack one of them with the noise button and ko him and then deal with the 3 left)
And the game only has a couple of mission with immediate fail state, if you disable the alarm and keep an eye on the people who try to call reinforces you can just go gun blazing, it is so easy to get street creed with the factions that being discovered is no biggie, the whole system is deep as a spiderman 1 puddle.
Stealth doesn't suck when done properly, tsushima and outlaws are just terrible stealth games, outlaws more than sushima.