I, too, ended here looking for "why". The mobile site is awful. I'm using Safari on iPad 2/iOS8 (yes, rather ancient) and new pages would randomly open in mobile mode. If I scrolled a lonnnnnggg way to the page bottom, I could choose Full Site (I think was the term). Then that wouldn't work. Having Opera Mini browser also onboard, I tried it, and it loaded full site and looked super. Ironically, when I came to this page to report success, it went into mobile view. Yech! Then full again.
I only look at Pprune on a mobile device now (at the desktop, I'm working) and I can't see how mobile view could ever be an advantage over full. Nothing like fixing something that wasn't broken.
