Right. If you want your app to look the same, custom way, ditching what the OS has to offer.
Some developers still believe an operating system has useful UI components and patterns worth adopting. From this thread it's clear that there's plenty who don't. Personally I view that as a regression.
Of course there is value in having "OS-native" buttons, transitions, windows etc. And many parts of GUIs are basically standardized. The problem is all the parts that are not, and have to look the same everywhere.
You can use JS but it doesn't ship a browser engine, it renders with its own lightweight toolkit.
Web is bad everywhere outside of the browser.
You clearly see the issue.
We are not that bad nowadays, it is a skill issue.
There are plenty of ways to have portable applications with native UIs without shipping a browser.
Somehow we managed to do it for decades and without AI writing the code for us.
If you want to ship a browser, I already have one, thus standard Web, with a daemon if it really must be.
Portable frameworks exist, but they are at most native to a single platform.
I don’t. VLC is available everywhere, so your requirement is clearly not a problem. Jetbrains is available on all major desktop OS.
Jetbrains is a better example, using Java with Swing which is not a common choice. As seen from my other comment, I do think this is a good direction, but it ain't any more native than Flutter or for what it's worth an Electron app, none of these are "what the OS provide". FYI Jetbrains has to do quite a few platform-specific tweaks to make them better citizens on each platform.
VLC went with QT (which has done all the hard work) for the UI, and their own libraries for the media playing part. Other software like Emacs and sublime has implemented their own UI libraries. Some just ship libraries and others build UI for them.
The issue with Electron is that it brings a whole jungle and a gorilla holding the single banana that the devs actually need. And the dev flung the whole thing at the users. It's like establishing an iron mine, a steel factory and then pollutes the whole region when building a quick stone bridge would do. Because the only thing you know are suspension bridges.