This is my issue with the single player missions and the reason i pretty much always only play either online or by myself with mods
Many shooters suffer from this. They can’t seem to make the AI realistically inaccurate. They have perfect aim, no sway, and no bullet dispersion. They only miss if there is an obstacle between you and them, yet they can see through it so they know you’re there.
Increasing the AI’s bullet dispersion seems like the easiest “fix” to being an army of Terminators, yet the devs seem reluctant to do that.
Can’t you do exactly that in game settings? Maybe I misremember. Normally I do leave the AI maxed out but accuracy down to 20-30%.

Looks like we’re getting a near-future MEU fantasy DLC soon.
It looks pretty great, too. I’m keen to play with it. I’m also prepared for the FrEe WiTh MoDs!11 crowd to screech, as usual.
The DLC is out today, and it looks like you were right.
The DLC for ARMA 4?
It’s like clockwork. They’re really the kind of people who are as predictable as a house tour. They love modders until modders want some kind of compensation for a lot of hardwork.