I have used a case on the last three phones, all Samsung, because they seem to be of a form factor intended to have a case. I find the naked phone to be a bit thing and slippery, so I get a case that doesn’t add a lot of thickness but has a rubbery kind of texture and slap a pop socket on the back to make it even easier to keep in my hand as I’m a bit clumsy and fumble stuff.

No screen protector though. Only cracked the corners of one phone that was in a flip case by fumbling it onto rough concrete sideways and the cover flipped open. No issues with the phones since with just a back and edge protector despite dropping it a number of times.