It would GREAT if instead of Rey getting a pep talk from Jedi she doesn’t know, Rey and Finn’s minds connect through the Force, and Finn, the person she actually knows, gives her that encouragement. It would sort of pay off all that build up, and Rey would realize Finn has the Force without him having to say anything.
I don’t think this is necessary. All the dead Jedi talking to Rey is the only thing that makes this movie feel like the conclusion of a saga, and we already got a confirmation of Finn’s force sensitivity with his “a feeling” moment during the final battle. It seems like a lot of work for neutral or even negative payoff.