Remember Luke had never heard of the Force in the original film. And Old Ben has to explain to him and the audience who and what the Jedi were.
The galaxy is a big place.
But Luke was a 19 year old who’d never left Tatooine. These characters are not comparable to that. I’ve always defended Han as a character who never encountered the force but none of these people have even heard of it or the Jedi? I mean I really don’t care but like I said it strains credulity.
I still don’t really get how they’re portraying Mandos in relation to what we’ve seen in the animated shows either. I imagine they’ll have to explain this a bit, with the dark saber in the picture.