Even if you can spot a non-native app in seconds, does it really matter? The vast majority of users simply won't notice and not care at all if it's native or built with Flutter, Xamarin, RN, etc.
The same has been said for Electron on desktop for years, but look at how VS Code is probably the top editor in use on desktop platforms, and even more demanding audience, like developers, don't really care that it's non-native.
The same has been said for Electron on desktop for years, but look at how VS Code is probably the top editor in use on desktop platforms, and even more demanding audience, like developers, don't really care that it's non-native.