Thanks you for the summary @KrisJohannesen. It's great to know what is possible, but it all still feels like a workaround. I really hope that Chao Cai's response means that we will real have multi-fact support in metric views.
Finally someone touching this important topic - I see great interest in migrating semantic layer from power bi to databricks, but lack of true multi-fact support is a major blocker in my opinion and therefore I'm cooling down the enthusiasm ;-). @Kri...