Then I have a very very very bad news for you: not only accuracy has been used in a lot of videogames you're not aware of, but in cyberpunk 2077 as well. From the demo:
View attachment 11003143
DPS: damage per second
PNT: penetration
ACC: accuracy
ROF: rate of fire
On the contrary of a realistic system that lets you improve your accuracy (because you get better at using a weapon, so you aim better and reduce recoil), an unrealistic system like +15% DMG present in CP2077 won't. So if the weapon is not accurate, that's it. You're welcome.
*If* accuracy is used in a way that produces misses, even though you've got the crosshairs on the target, it is a bad mechanic that never should have been put into the video game. That would be simultaneously unfun and immersion breaking.
The only way accuracy could potentially be used in a video game that works, is by having it affect the sway of your sights / crosshair when aiming. More accuracy = more steady.
Far too often than not the former is the route video games have gone, and when devs have opted for that route, it has always without fail resulted in gameplay that's shit.