If you are prone to scratching or damaging your electronics, than you should probably still use a screen protector.
If you have a history of never scratching or damaging them, as I do, then you won't.
It's that easy.
What he said.
I am pretty rough on my phone- not because I am reckless with it, but I travel a lot and it's are always getting dropped, banged, etc. I have a case on mine which I am very comfortable with AND a screen protector- which, btw, has a pretty nasty gash in it at present. So I think it's more about how you use your phone and not so much about build quality. And I really don't care about 'hiding' the beauty of the thing! It's a PHONE, not an amulet that I wear around my neck to demonstrate that I am a member of the Magical Order of iPhone Users!