> I still think we need something open and decentralized that competes with the App store and Play store, but one that offers apps that use basically the same APIs and technology that the native apps use.

Take a look at Flutter(which is similar to swiftUI). I know Google is behind it but it's so damn good. The JS community spends so much time creating new tools on top of older tools to achieve simple things that should be trivial in 2020. Meanwhile, flutter is typescript+react+webpack+component library + a bunch of npm dependencies(because dart has a proper standard library) + advanced styling/layout and animation primitives inside the programming language + amazing IDE support + compiler that generates optimized AOT native code.

Flutter Web is a huge bet though because it completely throws away every web tech and builds UIs on top of <canvas>. That way you get the same API's you get on mobiles. The results are not good right now but alongside Microsoft's Blazor they are the only technologies competing with the broken web landscape.