Qt is fully of bugs on Wayland, some of which are unfixable because the API makes guarantees that are impossible to uphold. I've reported a few issues upstream where there's no apparent path to fixing them (after years), and have reported countless bugs to applications which are just a bug/incoherency in Qt that can't be fixed.

Flutter is an absolute nightmare to install and work with. Even now the few bleeding-edge distributions where it's available are lagging behind many releases because of the pain that it is to maintain it. I don't want that level of pain as a pre-condition to building my software.