Ep9 is probably the worst Star Wars movie but one thing it did correctly was fix Finn's storyline. He left the movie with the most potential.
Rey and Poe are only thinly sketched in characters. Abrams probably figured if SW already had one desert dwelling young adult with force potential there was no need to actually create a backstory. We, the audience, would just "get it". Her story is too intertwined with Ren's and she left the series without much story of her own.
Poe's just a generic maverick who gets by with some swagger, a cute robot and assumed piloting skills.