The Mandalorian proves the concept, though. It’s a nerdy deep-dive show that found mass appeal—partially because it resonated with superfans who then recommmended the show and generated a TON of content around them (explainer videos, memes, fan fiction, etc).
You’re right that it’s a tricky tightrope to walk, though. The Book of Boba Fett was full of fan service, but may have been lost in the space between Star Wars super nerds and the general population who really just liked Baby Yoda.
I’m wondering if this might be the case with the Starcruiser—for the Boomer/GenX fans, it’s not “Starwarsy” enough, and for the casual “fans,” it’s too nerdy.