That’s my take too, FWIW.
Yeah, this is a character about whom (canonically) we know almost nothing and, since the last time we saw him, has Been Through Some Shit™ … which we're still in the process of finding out about. I think a lot fans have a notion of a bad-ass that's largely been created in their heads, or derived from a chunk of material explicity ruled non-canon, which this version isn't matching up to.
(You'd think the fact that he has to keep putting himself into one of those medical tank thingies every time he mildly exerts himself would tip people off that this is a man no longer in peak condition…)
And, fundamentally, super-competent bad-asses* don't make for good television. I'm not sure you could get eight (or whatever) episodes out of Boba Fett marching into Mos Espa, declaring himself King of Everything, then killing anyone who disagrees.
*Yes, I know Din Djarin is super-competent compared to Fett, but he hasn't been burned by Sarlacc digestive juices and been through still-not-entirely-revealed stuff in the Tatooine desert… and they still had to give Djarin Grogu to create an Achilles' Heel for the character.
