People use Dart on the server and seem to be quite happy with it: see for example https://aqueduct.io/ https://aqueduct.io/ as an example of homegrown server fr

People use Dart on the server and seem to be quite happy with it: see for example https://aqueduct.io/ https://aqueduct.io/ as an example of homegrown server framework that heavily relies on mirrors. But it is true that mirrors more dead than alive on the JS target. I also would expect that eventually Flutter would want something in this space that is compatible with AOT compilation because it allows to tremendously cut down on boilerplate in some cases.