Meego or Sailfish are niche systems compared to Alpine and it's my understanding they don't graphical applications from desktop Linux systems, though I'd take any GNU over Android.
The problem is phones require a different UX than desktops. That’s the reason why Apple has two similar but different frameworks between iOS and macOS, and windows 10 attempts at cross-device (touch or mouse, your choice!) have largely failed. A menu bar, for example, won’t work well at all on a phone but is ubiquitous for X-based apps.
I'm honestly not convinced of this. I know it's gone terribly so far, but it's not clear to me that that's an interface issue and not an ecosystem problem with the phones in question. A menu bar, for instance, would certainly be unwieldy, but themed with large text it's no different than toolbars which certainly are found on mobile. It would frequently be clunky, but even limited support for the universe of existing software would in my opinion have a massive effect on the usability of any new platform.
