Laura has not only a separate life from Logan, we see Laura act as a big sister/mother to Gabby.
Polaris suffered in the 80s as Claremont had little interest in her and nobody wanted else wanted her.
Meanwhile people like Beast, Angel, and Iceman got lots of development.
Lorna has no children, she cannot keep a man, she doesn’t go off on her own, she’s not a leader, her power set is not unique, so all she can do is be a random team member unless someone decides to actually make a a protagonist instead of a supporting character.