No, it doesn't seem crazy, but it's also not really what users want. Android users probably expect native Android behaviour, iOS users definitely expect native iOS widgets, anything else will feel quite off.

I guess it depends on the app. Google's own apps on iOS don't strike me as feeling very native. I would think they'll get closer to nailing the Android behaviour. In a way these toolkits fill a space like Electron on the desktop where the developer won't, or can't, for all in on a native experience.

As someone who built some mobile apps with web technology I can see how Flutter would have an appeal because going into the project you've already given up on the native experience. There are still (unfortunately?) a world of marketing-driven apps with the brand overriding design choices which would be suited to this. Tools like Xamarin probably have a lead for line-of-business apps inside companies due to the MS ecosystem integration, but I could see people choosing Flutter for these apps if it's easy to build and maintain apps.

None of this changes the fact that for best-of-breed apps in a public store you'll need to use the native toolkits.

This reminds me of switching from Windows to Linux in the noughties: one of the complaints about Linux not being 'suitable for average users' was the lack of consistency between GTK/Gnome and Qt/KDE applications, and a lot of effort was spend on compatibility layers and such.

When I looked at a friend's Windows XP installation, it struck me that pretty much every application they used had a different UI system: WinAmp, Firefox, Opera, Windows Media Player, MSN Messenger, ...

> Google's own apps on iOS don't strike me as feeling very native.

That is true, but does anyone actually like the feel of google's iOS apps? I personally think they're awful, but the content they present is so useful that people use them anyway.

I don't disagree, but they have reasonably good performance which covers a lot of sins.

Sure, they don't stutter and they serve a crazy amount of very useful information.

Performance is not everything. I expect iOS apps to behave and look like iOS apps, not just run fast. Google's software looks like fisher-price third-rate crap on iOS.

This is very true when it comes to consumer apps, but in our experience businesses prefer a more unified experience for their users--it minimizes the training effort.