I see the point you're making, but part of the outline you post is that it is quite focused on Obi-Wan, and only Obi-Wan. While an understandable approach, what I find with Star Wars is the tend towards more and more myopic storytelling, focusing on the three mains, and only those three. Except, if the franchise is to continue on then broadening the scope of storytelling is very important. Like in Clone Wars and the inclusion of Ahsoka and Rex as an expansion of points of view.
Obi-Wan could easily have been a singularly focused character piece and fine for it, but limit the scope to characters already known. But, Vader, and Obi-Wan's choices, had an impact on many other people and actually defined those moments in their lives, even as they tried to move on from their own wounds. (Insert M. Bison meme here).
What I appreciate about all the Disney shows, even the Mandalorian, adds such incredible color to the larger galaxy, and the people beyond the mains, or even add to the depth of past lines that might seem minor in the past. Leia's whole relationship with Obi-Wan takes on a new depth, a sweet history, and how Obi-Wan impacted her life. How he watched over Luke, and moved from a wounded and defeated Jedi to the strong and confident protector who would face down Maul and then sacrifice himself with confidence he could continue to support his charges.
Again, my opinion, and yours is welcome. But, I think that shows like Obi-Wan Kenobi and Andor show way more life to the galaxy than just the main characters. The galaxy becomes a real place.