Every GTK app I've ever used that didn't come with the OS (granted, I've never actually paid for one) is, compared to most electron apps, a) ugly/buggy, and b) feature-anemic, because it's so much less easy to add features to it. And as a user, I've never noticed a performance difference. I know Electron uses more memory and such, but it just doesn't impact actual usage in my experience. Whereas things not getting implemented because of developer friction absolutely does.