I call BS. I just downloaded it and it works fine. Literally every single one of your comments has it out for this transition. I trust my own experience and their data.
By "fine" I mean it does what I expect it to, doesn't throw bizarre errors and hasn't crashed (so far). Could it be faster? Sure. Does it bother me? Not even the slightest. So many apps I use regularly run much slower than this.
This is the error that most web devs make. Their definition of fine is so low, that they can't comprehend reasoning why web tech is inferior on mobile.
Nope, on Android you'll have to interface with native toolkit anyway. Even if you write everything in C. Just follow the platform instead of fighting it.