I wouldn't exactly call Flutter native. It uses its own rendering engine and doesn't necessarily behave like operating system native controls. It is not really different from using electron.
Using electron at least uses some UI primitives from chromium. Flutter has thrown away all the usability and robustness of existing components and just reimplemented everything. It absolutely is different from electron
"Native" seems to mean different things to different people. I'm mostly with you on this, but the tides are turning. In any case, the other 3 do use real native widgets.
Of course, there's no need for them to be. But this conversation started out with "why do people use web based UI solutions?" and "because there is no proper UI library that does cross platform as well as the web".
