I'm actually fine with OWLaura sticking around so she can be with Everett and current Laura can live her life. There's a lot to mine from OWL and her time in the Vault, the trauma she will need to heal from and what the real ramifications may be of all that time in the Vault.
I don't think Serafina is okay with the trap and she likely has the City already working on a workaround. I thought things were left off pretty tense and foreboding with the Children. They're going to strike back at some point and it's gonna be major.