100% agreement here.
If they'd wanted Rose in this film, why didn't they make her part of the 'trio' instead of Rey?
I like REG, Russell and Monaghan very much, but they were completely unnecessary here, although Russell was interesting. The others were shoehorned in at the cost of Gleeson and Tran. Harris would have been better as Finn's long lost sister, her being Lando's daughter added nothing to the story, apart from endorsing that Lando was firmly heterosexual after what was said about his character in Solo.
Rose was a creation of Johnson, so naturally she had to go.