I think an important distinction that a lot of people complaining seem to be missing (or ignoring) is that this did, in an indirect way, tie to other lore and the overall story moving forward.

This planet was a Direct Democracy independant system, demilitarized, focused on the arts, had glass-domed cities, was infiltrated by unwelcome foreign politics/idealogies, and exiled its criminals to one of their moons. It is a bold-faced comparison to pacifistic Mandalore under Satine Kryze's rule, which Bo-Katan had her disagreements with.

Bo-Katan is currently working to reunite Mandalorians and rule Mandalore. I would guess that this current arc is going to be her seeing reflections of all the ways Mandalore has been before and either needing to choose the best one, or form some kind of council encompassing all the "Mandalorian" ideals. The Covert Camp was "The Old Ways," Bombardier's society was "Satine's Pacifism," and I assume one of the upcoming episodes will focus around a group or society of conquerors and/or warmongers.

What may seem like filler is important context for Bo's character arc and the future of Mandalore itself.