No, because by phone is perfect when I got it.
Eventually, the phone will be flawed with constant use. The battery gets weaker, a few nicks in the metal band, a dead pixel appears, etc. Nothing stays perfect forever. I once tried doing that to my video game consoles, and the more I wanted it flawless by not using and keeping them dust-free, the more I was just babysitting an expensive paperweight that would get replaced eventually. Now some of my old game systems just sit in a box somewhere in my garage. It is just a phone. Not a $15K diamond ring. We use it as tools to affect our lives in an efficient way. You won't bury yourself with it or take it with you in some afterlife (if there is one). I know what it is like to be OCD. Like Howard Hughes, it will drive you nuts eventually. Not worth it. Like with people who made the device, learn to accept imperfections.
I say once the honeymoon period wears off (and it will), you take out the case and stop caring because it is no longer "new" and pristine. If you sell it next year, you are just doing a big favor to the new owners while likely never seeing or using it again anyway.
And I agree about the signal problems could depend on where you live. I live in an area with strong signal and can't replicate the problem. I basically have a bumper not because of the death grip signal problem, but the fact I don't like the feel of the edges of the phone and the fact the glass protudes on both sides without the bezel anymore. Easy shatter. The bumper still makes it look slick anyway..