Because mobile apps just have to be written in Go? There’s just nothing else out there that can handle the highly special and rare use case of UI programming? ;)
Probably a cool hobby project (and there’s nothing wrong with having hobbies!) but in it’s current state I don’t feel this to be too useful.
Just thinking aloud from my rear end: how about making a cross-platform framework with Swift? It already works well in the other major platform :)