Does it contain a Kyber crystal, or is that not yet established?
Everything we officially know about it is recorded in the
Darksaber entry on Wookieepedia, and according to it, the
Ultimate Star Wars book established that it does, indeed, have a kyber crystal. It must be a unique one!
Star Wars has a history of grandiose structures, and there has already been a ringworld in TCW. It doesn't have to be hard SF.
I don't remember there being a ringworld in the Clone Wars. But that's OK. I'll get over my initial reaction here.
EDIT: Apparently this ringworld is known as
Glavis.
I think it's meant to be a psychological/spiritual thing. Since it's a lightsaber, it's attuned to the Force. Even if you're not a Force-wielder, you still kind of have to get in the right mental/spiritual zone (aka become attuned to it) in order to be able to wield it properly. Otherwise it "fights" you, thus making it
feel heavy.
So, making weapons out of Beskar is a no-go, but making tools out of Beskar and then using them as weapons is perfectly fine, as is making the hilt of a weapon out of Beskar, so long as the part that you're actually using as a weapon isn't made of Beskar.
I love the Mandalorian, but this is absolute nonsense. (Well, given that an extremist cult of zealots made up these rules, that could be an in-world explanation for that, but that's still a pretty weak argument.)
For one thing, I think we may be placing too much power in the Armorer's words. She is clearly a biased narrator. There's a lot of sense in what she says about Bo-Katan but that could also just be, like, her opinion, man.
Bo-Katan, in turn, has plenty of biases of her own. She was pretty dismissive of Din's cult, despite it being an offshoot of Death Watch (which she was part of in her youth), and she was downright hostile toward Boba Fett. She's also got clear aristocratic leanings.
I think this just goes to show how tribal the Mandalorian culture still is, even after the Imperial purge. They fought each other so much in previous millennia that they ruined their homeworld's ecosystem (which is why they're seen living in enclosed bubble cities in the Clone Wars and is the impetus for Bo-Katan's sister Satine's push toward pacifism) and severely damaged their colony world of Concord Dawn (which is where Jango Fett became a foundling incidentally).
No no no. Go back and watch again. When he is just using it as a weapon while on the bounty hunt at the beginning of the episode, he used it just fine. No weight issue. That only started when he began training with it and was trying to master/control the sword just by strength and force of will. The sword resisted that and grew heavier the more Din tried. Whether that is just how the Force flows through the blade, we don't know. And if Din is not Force sensitive, he may never fully control it.
Sabine mastered it, didn't she? And she's not (yet) been shown to be Force sensitive. And the Armorer seemed to think Din could master it. He just needed to get his mind/spirit sorted out. I expect the showrunners are building up to Din becoming the new ruler of Mandalore.