What I'm on about is my friend hasn't seen the Star Wars prequels because she's not interested in them. She's seen the rest and wanted to see this movie because she likes Han Solo and of course, it's a stand alone spin off movie. Meaning you shouldn't need any prior knowledge in order to get it. Once that Darth Maul scene came up though, she was really confused and had no idea what it meant or what it's about. The film was clearly playing it like you were supposed to know who that is, but this isn't a character who's been seen on the big screen since The Phantom Menace in 1999.
The problem with it is it serves absolutely no purpose to the movie itself and completely relies on the audience's knowledge of other films in order for it to mean anything.
And how does Infinity War fit into this? I haven't said if I liked that movie. I do however know plenty of people who hasn't seen all the MCU movies but still understood the movie because it treats these things well enough for it to stand on its own for the most part. For example you don't need to know who the Red Skull is because it doesn't matter to the movie, you won't react to it if you don't know who it is. With Darth Maul, the scene is about that reveal.
EDIT: Wait what? You do know the emperor was in the original cut of Empire as well right? The movie released 19 years before the first prequel even came out? You hear about the emperor multiple times in the original movie and in Empire leading up to that moment, you then finally see him in Return of the Jedi. You absolutely do not need to have seen movies that hadn't even come out by that point to get it.