Your nonchalant mention of "Xamarin or whatever" means to me you have little experience with that.

You say that Flutter takes the best ideas of UI toolkits, but then say it's mostly web engine developers. So which one is it? Let me guess, they are using Flex as layout? So hardly the "best ideas". Edit: Yes, flex [0]

On the other hand, I don't need to use it to predict how bad quality apps will turn out to be. Just like Electron and React Native apps are bad, so will Flutter apps be, for the simple facts no native controls are used. (React "Native" is not native at all.) Even the best implementation (which Electron and React Native do not have) would still mean bad apps simply because they are not using native widgets.

You seem to only care about developer experience—which I disagree as well. I only care about user experience. User experience is king and developer experience is complimentary.

[0] https://github.com/flutter/flutter/blob/master/packages/flut...

You could live-reload Qt code for years (https://doc.qt.io/QtQmlLive/index.html)

On Mac, they use native widgets:

https://github.com/qt/qt/search?utf8=%E2%9C%93&q=qt_mac_nati...

The usual fallacy. What you can do with 2 cross platform developers + 1 iOS + 1 Android, you can achieve with 1 iOS expert, 1 Android expert and one who can do both iOS and Android well enough.

> but who will do this

Anyone who wants quality apps. So basically not most start ups, I guess.

> can have 95% of the same with 2 flutter devs

False. Just like it's false with Electron and React Native. At most you have 75%, and that's the most simplest apps. At least with React Native, you can somewhat easily integrate native components. It's ridiculously hard with Flutter. (For example, see how long it took to integrate with MapKit.)