You're forgetting some people (like me) don't put price as the top factor. The OP3 is too big, I hate large phones. I also have this borderline allergic reaction to third-party skins after dealing with years and years of Samsung. Then there's the final nail in the coffin - bugs. I used to root and then roll cyanogenmod and there were always these small little bugs that never quite got worked out. I had the same issue with my original OP1, and it appears the same sort of thing exists with the OP3.

If oneplus worked with Google to put vanilla android | a fully supported bug free version | onto the OP3 I'd consider it, but the form factor would still likely be a deal breaker.