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Material Design 3 Not In Flutter 3.3
While yes, there is a useMaterial3 flag and Google has announced Material Design 3 support in Flutter 3.3; not everything is exactly Material Design 3 yet. This is a detail look at what is not Material Design 3 yet and what workarounds can be used.
In simple terms, the Flutter SDK is resource constrained since Google is supporting 3 front-end frameworks. Thus, the design better with more code power way of coping is to put the Flex Color Scheme package on top of the flutter SDK to cut down on theme configuration and re-deploy that coding time to filling in the other Material Design gaps that Flex Color Scheme does not cover.
The GitHub issue this stems from is this one, 91605: