It’s obvious they really didn’t have much of a story here. We can speculate that this was the result of some studio mandate forcing Grogu back into the narrative. I give that a ~90% likelihood of being true, since Grogu has little effect on the story-line. But even if true, it doesn’t seem like there was any well-defined story involving Din by himself either. Rather, it seems the writers just lost interest after Season 2 and didn’t really have much further story to tell.
Plus, they keep talking about “retaking Mandalore” as if it was an enemy-occupied territory. But it’s just a desolate nuclear wasteland. What does it even mean to “retake” it? Anyone is free to head over to Mandalore and start building some houses if they want. The only thing they need to “retake” it from is a high probability of thyroid cancer from radioactive iodine over the next 20,000 years.
I kind of suspect the writers haven’t really even thought this through, which is why a lot of the episodes this season sort of just string you along with filler, evading the main through-line. The same thing happened with Book of Boba Fett, where there was barely any story (or just dead-end story lines, like that Hutt brother & sister) up until the second-to-last episode, leaving the finale to resolve the paper-thin story.
On the other hand, The Mandalorian was always partially an episodic “side quest of the week” show. But this was easier to enjoy back in Season 1 when the show was just this small-scale adventure across backwater worlds. The simple through-line of “protect the child” was enough to carry the show. But in Season 3 we have multiple larger-scale plot-lines that barely even involve Din Djarin, and it all congeals into a sense of aimlessness. After the through-line of bathing in the subterranean waters was resolved early, the only remaining through-lines are (1) retake Mandalore (whatever that means) or (2) some ominous vagueness about Gideon or some undefined Imperial threat. And neither of these through-lines really even involve Din Djarin personally, apart from the fact that he happens to have the Dark Saber (an object that he doesn’t seem to care about that much.) But worst of all, I think, is that this Season nullified all the emotional consequences of the previous season. This casts a pretty dark shadow of apathy over the whole show, exacerbating the aimlessness and making it a lot harder to care about anything going forward.
Personally, I think it would have been more interesting if they used Bo Katan as an antagonist to Din (which is where I thought they were going), but it seems that is not the case. In retrospect, making her an antagonist would be difficult since Din doesn’t really give a shit about the Dark Saber or leading Mandalore or anything like that.