The way I see it, the Mandalorian is a mature story. Not insanely original, but neither is Empire. The characters in the Mandalorian all have reasonable motivations… Cara is good but still cares about surviving, the Guild Leader (blanking on name) is only interested in the money. The bandits in Chapter Six act that way because yes, there are people who act like that and they exist in the Star Wars universe. We see them in the Cantina in ANH. If you were expecting them to be sympathetic, that falls down on one’s personal expectations.

But moving forward, I’d say the Mandalorian is more morally complicated than Empire. Because Empire isn’t as nuanced as you claim. The heroes start good and end good. The villains are bad and end bad, with Vader the sole exception. But you can’t pull off a twist like that multiple times, and still for the purposes of the movie Vader was bad from start to finish. It’s not like he suddenly reveals he an undercover agent which makes us question the conflict.

The Mandalorian actually starts bad and has a redemption story right there. Is it wildly new? No. But it’s far more mature a story than Empire’s “good guys run from bad guys, and learn that fighting isn’t always a good idea”.