Every phone should have some kind of screen protector. Screens get scratched and rubbed. If you have to replace a $5 or $10 screen protector every year or so, it's a minor annoyance. If you have to replace the screen every year or so (I can hear someone saying "you can just replace the glass" - but due to the much tougher that job is, the labor goes way up, so the total price is about the same either way) is a major expense and it means doing without your phone for a day or so.