Of course you'll always have different ways of building UIs depending on circumstances but eventually some consensus will be reached for a default approach.
WinForms used to be the default for Windows, Tk was the default for Linux (or at least that was my impression, I was all in on Windows back then), etc.
For many people, using web tech has become the default if you want to build cross platform UIs. You have the option of building with imgui, Qt, Gtk, etc. but I don't think it's controversial to say that your average dev who wants to make a cross-platform GUI will probably use Electron or an Electron-like.
I really want to have a default for the Rust space. I've even done some work here myself which is why it's surprising to me that we aren't there yet