Earlier quoted context omitted.
It's because there are a lot of people here obsessed with reaching the largest possible audience they possibly can. And since every brother and their mother are on mobile, or, at least, a web browser... The way I see it, mainstream masses are finally (FINALLY!) leaving the world of desktop computing behind, so now it can return to the nerds and people who just wanna do shit
How about new ideas like WebAssembly?
WebAssembly just makes a better target for transpilers, it doesn't really do anything to make developing "desktop" apps inside browsers easier.