[nine_k]

Who solves this problem any better in the cross-platform GUI space?

Well, maybe Qt, but even if it does, C++ is much less forgiving than TS.

[taeric]

Doesn't change that it is the problem that they are trying to solve, though? Does it?

[knewter]

Flutter

[woojoo666]

Electron. Everybody knows about the performance issues, but there's a reason why people still use it

[WirelessGigabit]

Stop shipping a browser with your website.

[nine_k]

I'm not sure Electron proper is a viable path for mobile development.

Offline-capable web apps are, or course, a viable alternative, as long as you can afford ignoring iOS.