I’ve been using sleeves/pouches since the Nexus 5 as I really prefer using a naked phone. I really liked them, protection in the pocket and also a clean phone as it’s cleaned every time you put it in and out of the sleeve.
I’ve gotten clumsy though over the years so I think for my next phone I’ll have to get a proper case. I’ll hate it, but it’s better than a damaged phone 😢