Nothing wrong with it but doing it for the sake of it would be pointless. Any notion of a Poe and Finn relationship is ridiculous. Finn with his “boyfriend” remark did subtly hint at an attraction to Rey already anyway. For all we know Poe could be gay, but frankly I don’t care, if they want to make a passing reference to it then fine, making a story out of Poe’s love life whichever way he swings would probably be some unnecessary side story.
Of note, our two major relationships in Star Wars result in important children and at this stage there is also the possibility of Rey being Luke’s daughter so a non-reproducing relationship has something of a dead end to it rather than being part of a saga.
As for romance generally - it doesn’t really work in the PT (I don’t like sand etc) and in the first two OT films it’s tied in with the Luke/Han rivalry so it serves a function.