You can disagree but it still doesn't change that the inspiration for The Mandalorian westerns and a rotating cast of people he encounters on his Adventures. Yes they have had themes or a over all arc but it is still a show intended to have a rotating cast of characters. Which means any detailed or interesting character can be around for just one episode. The only other option is a glorified extra which makes for a boring show.
Cobb Vanth is literally the same thing as what you describe for Ashoka. We just don't know if he will get a spin off or appear in other shows like we did with Ashoka. So it is a bit weird for you to praise one but not the other. A nothing planet fighting a faceless enmey is essentially the core of theme of the show. Because it is a space western following a space cowboy (bounty hunter) on his travels around the Galaxy.