Most of them can be solved by using a more modern but similar toolkit like Jetpack Compose, JavaFX etc. Then you have distribution, but to get rid of the scary warnings just requires you buy signing certificates. Distribution is still a pain after that, but that's why I built Conveyor, to simplify it.

Going further would require remixing bits of Chromium to create a browser-like thing with a sandbox, but which is much less opinionated about what runs inside of it.

Problem is, for there to be a market requires that devs (or someone) pays for it. How much would you pay to be able to not write a web app?