Seems like a case of Dart being a solution looking for a problem.
Daniel Earwicker

They only dropped plans to integrate the Dart VM into Chrome a few years ago. There were never plans to drop the VM itself.

For iOS they implemented ahead of time compilation for Dart, so that there is no dynamic code execution (which is not allowed on iOS as you mentioned).

Flutter for iOS is real, not just an idea and there are already production apps being built for Android and iOS.

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