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Yes, same here. I'd love an open source Power BI alternative.

Originally from Airbnb. Very powerful and flexible OS frontend BI tool

a) Apache Superset is neither powerful nor flexible. It has the absolute minimum functionality to still be called a "BI tool", but just barely.

b) Sadly, Apache Superset is the only "BI tool" that is both free and open source, so you don't have any choice in the matter anyways.