alt Hacker NewsI mean, both wxWidgets and Qt are fine, no? GTK 2 and 3 as well (4+ is... meh). There are plenty applications using one of these (often via python bindings).
I think it is more of a staffing problem. Plenty of people know web development, so you want to use those people for desktop as well. Having desktop be JS (electron) helps a lot with that.
A year ago I would have agreed with you, but now anyone can build a perfectly reasonable native app.