JavaFX surely runs on iOS, just not for the "I want everything for free" crowd.

http://gluonhq.com/products/mobile/

> XAML is not 100% the same everywhere, anyway.

Hence XAML Standard,

https://github.com/Microsoft/xaml-standard

"While your Electron app will be tweaked to make a Cordova app that runs on iOS."

And be incredibly shitty.

If you care about your users and their experience, you won't write apps in JS to begin with.

My point of view is that if it is to be done with the Web stack, then by all means it should be delivered to whatever browser the user likes to use on their platform.

Anything else should take advantage of the native UI/UX tooling.