Except Flutter is a subpar experience on every platform because of just how slightly different it behaves and Kirigami / Qt Quick is just not a viable thing, there's barely any community and/or "serious" project on Windows, macOS or mobile. I'm not trying to discredit the KDE folks, but that is reality. Also, Qt Quick licensing is not so easy (or very expensive if you go commercial) for iOS.

Whereas electron has a) big major corporations betting on it shipping extremely polished, Production-ready tools and b) a gigantic community and library ecosystem, plus not any obscure programming language (such as Dart).

Telegram really goes the extra mile, though. Their client is amazing.