I'm just playing the devil's advocate/trying to understand why someone would actually use it. And yes if desktop Linux gets big that'll certainly make this entire comment seem stupid (which would be pretty nice:)
What is this 'if' of which you speak? I've been using Linux as my daily driver desktop for over a decade ;-) It's not likely to ever become a mainstream desktop, nor are these Linux phones, but there are a fair number of us who don't care if they do or not. We just want them for ourselves.