Ultimately it’s hard to evaluate using a single simplistic app. It’s not a matter of setting up a better evaluation but rather real life.

A different way to look at this is adoption, and flutter isn’t at all popular. I don’t believe that’s only a matter of visibility.

React Native is the 5th and Xamarin is the 7th most used frameworks for iOS while flutter is 15th, and similarly among Android apps where it’s 10th.

Source: https://appfigures.com/top-sdks/development/all

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We just recently shipped an Android app built with react native and while we ran into a variety of challenges to keep the UI smooth the rest was very easy. If flutter was as easy I’d imagine it’d see more adoption.