Every phone I've had since 2012, I've had a screen protector and a case for it.
The last one I had, I used a screen protector and a case and I used that phone for 3 years with no physical damages. This current one, I've used for 4 months without a screen protector nor a case has fallen 8 times or more and I am considering buying a case and screen protector to rest my heart.

So how about you, what do you think of screen protectors and cases?
Do you use them? Why don't you use them?