I think the Ghost King's people have always had beef with the people of Gondor, and at this point their cursed selves have just been stewing in resentment for however many centuries. So, I guess it's just bitterness for their curse (whilst also stubbornly/eventually acknowledging their part in breaking their oath in the first place leading to the curse). So, their resistance to immediately follow Aragorn is just momentary pride/wanting to save face, which then gives way to a desire to 'move on'/be released from the limbo of being stuck in that state.

TL;DR - the Ghost King doesn't want to bend the knee right away out of pride, but ultimately wants to lift the curse so agrees to Aragorn's terms

It requires you to have the same (or at least understand his) reverence for Hollywood/LA lore. He portrays it as a place with a strong sense of Movie Magic/Movie History, and then within that urban fairytale he seeks to subvert that real history to grant a sort of small, retroactive justice to one of its unfortunate starlets, because she represents a million other starry eyed people who went to Hollywood to "make it" for a love of movies. I guess he's simultaneously showing the power and the grime of the LA dream, and also just having fun bending the reality of it.

It's his favourite because it's probably the most personal one in terms of representing his feelings about filmmaking and LA. It's like a film nerds love letter.

But all that makes it less accessible if you're just there for pure story, not atmos.

Universal critical acclaim, AFI Top 10 movie of its year and Best Picture/ Best Editing/ Best Original Screenplay nominee turns out to be good; redditor surprised. More news at 11.