Eeh. It might be perception, but I feel like it was the other way around — around the time iPhone came out, a lot of apps eschewed compliance in favour of achieving clearer identity. I think that cleared the way for electron — I actually vaguely remember some people talking about using html-based apps because they made achieving a specific visual design easier, not because of the portability benefits.

And for example AFAIK the new Apple Music app is using a web view for some parts of itself, and as much as I like having "light" apps, I generally prefer interacting with Electron UIs over most QT apps.