Honestly, I feel TFA did resolve the whole parents issue. “They’re never coming back.” Bam. Done. Endgame. Nothing else needs be said. TFA never plays up their identities as a mystery. They’re nothing more than a plot device used to hold Rey back, to keep her from “accepting the call.” They’re an anchor around her neck, pulling her back to Jakku, and causing her to push away the actual family she is cultivating: Finn, Han, Chewie. So I honestly have no idea why fans obsessed over this for two years. I just rolled my eyes and crossed my fingers that no one would be stupid enough to ruin all of that and make them Luke Skywalker or some other such nonsense.
I do tend to agree that, if TLJ didn’t decide that her parents were important to her story anymore, there is a way it could have worked (where you assume that she has managed to truly move beyond them within in the story of TFA).
It is a bit of a mystery though in TFA (namely, why did they leave her?), though just because it is a mystery doesn’t mean it needs to be solved. But ultimately I do think it is to the benefit of Rey’s character that it is definitively resolved in this way.