It was an excuse to have one encounter; one fight. 6 episodes is a huge ask just to set up a sort-of-kind-of redemption arc for Obi Wan. It doesn't really work when you size it all up -- Leia wasn't acted particularly poorly, but I think it was a bit of a miscast. Ewen McGregor sounded like he was doing the Halston accent until the final episodes, which was weird. There wasn't really any time for Obi Wan to deal with trauma and reflect on his relationship, which is probably the main reason anyone would want to watch. Reva was a complete misstep and ended up being a wedge between the viewer and the content they wanted to see (though I think the actress did fine). I think they could have told this story in 3 episodes by cutting out repetition, unneeded characters and mini-arcs that failed to have emotional resonance, and it would still by kinda bad because the direction was really horrible, but it would be succinct in a way that would make it feel like what it is as a side-story rather than some meaningful epic.