The question is :
compared to which other Linux ?

Ubuntu Touch ? Canonical has given up, leaving only UBPorts community to handle everything on their own without any company putting ressource (money/dev time) into it.

webOS ? Well, LG doesn't seem interested into anything else than using it on their smart TV and leaving luneOS community on their own. (No "webOS OpenSource editioin" doesn't count. Leaving things in open access (that were already accessible during HP's "OpenWebOS" phase anyway) won't magically start widespread use. Unless they are throwing the necessary ressources, dev time, etc.)

openmoko FreeSmartphone.Org / SHR ? Yeah speak about necromancy.

Debian ? Gentoo ? well, you can probably install them, and there's probably some "emerge phonetoo"-alike stuff to get some not very integrated semi functional phone middleware sortof working.


There are no other "full-blown GNU/Linux" OSes for smartphone on the market now, propped by sufficient ressources (dev time).