The screen protector you refer to is just a piece of plastic thats supplied as part of the packaging, underneath this is the actual phone screen thats made from Gorilla 6 glass.
I left mine on my S10+ screen to protect the screen and bought a thin carbon fibre syle ultra thin case. My phone is in and out of my pocket about 40 - 50 times during an averge day, i work in a joinery wood shop and my front pocket, where i keep my phone, takes some beating on a daily basis. It also gets dropped onto a hard floor around 3 times a week and The plastic screen protector is still about 98% perfect, the back case is showing some wear though.
I don't understand how the &%$* anybody could beat up the protector in about 2 months, unless of course they dont treat it as an £800 phone?