Both Kenobi and the ST suffer from the same basic issue. There is no story to tell, and both end in the same place where it started. Ultimately some of us are left wondering what was added to the overall story set out in the first six films. Star Wars has nothing new to say. It’s just regurgitating past stories while throwing in insufferable amounts of fan service.
I respect your opinion, but totally disagree. Sure, the saga can exist without this series, but this series addresses what Kenobi might have had to deal with after ROTS and before he could be the character he was in ANH. It brings the inquisitors into the live action canon (remember, Vader only helped the empire hunt down and destroy the Jedi - the Inquisitors were the ones doing most of the work). As for fan service, it is only insufferable if you don’t appreciate it. Those of us who appreciate it love every moment of it.
It addresses what Kenobi might have had to deal with by giving us another variation of what was already done in The Last Jedi. Star Wars is just going in circles. To me it’s just becoming very tiring, and reductive. There’s just so little originality. The start and end point of all these stories are set in stone, while the road in between is just repeating what was done before. Star Wars has become stale, like an old rock band who after 40+ years just plays the same set list over and over with very slight variations in the arangements of the music. I really hope Taika Waititi can do something different and exciting with his film, and thus inspire Lucasfilm to hire some good writers, that can bring back some creativity to this creative black hole.