Maybe because wxWidgets is garbage DX and UX wise, and Qt isn’t free and doesn’t allow you to reuse web code? One of the value prop of electron is to reuse your web codebase.
I don't see how reusing web code is an advantage. Web code is for the web. We are talking about a native platform (Windows 11) which has a mature API platform stretching back decades. Why would you need to make it "web"?