There are quite a few that are caseless. But it is up to them to decide whether they should protect the phone or not, it is their phone and not mine.
There are quite of people that I know that uses the case, even 6 months ago or a year ago, they still use the case. For me it is better to be safe then being sorry.
I do use my case, and have yet to drop mine. I am using the aluminum bumper case by Element case, Vapor COMP, White edition, and it came with the zipper case. So my phone is always in the zipper case when not in use.