ALL mise features are experimental until the design is finalized. I don’t do breaking changes except in exceptional circumstances with a long procedure, so experimental means I have the liberty of making them in any release. It is not at all any marker of quality. That said, in practice I don’t make them often.

I’d argue it’s a good time to play with features since if you have any ideas on how it might better fit your workflow I still have the ability to change the design before it’s largely frozen.