Even in terms of quality, the web beats most of those platforms. Especially now, and especially when compared to GTK or Wx. You'd actually have an easier time building a native-like app using web technology than GTK or Wx.

I guess that wasn't the case a decade back when the web for everything trend started, so your point about ease of use/bypassing stupid security policies is still right about how the shift started, I think. But that eventually led to a steady improvement.