Never played any of them except a bit of Content Warning. But all the gameplay I've seen of Peak, Lethal Company, REPO, etc. just looks like a walking simulator with voice chat.
Never understood the "it's fun with friends" thing because literally any game can be fun with friends.
So basically they’re relying on the multiplayer aspect way too much instead of actually fleshing out their games and it ends up being an excuse used by lazy developers.