Phoebe should've had the baby or at least been allowed to properly mourn him rather than that lazy cop out..

like it made no sense for the baby to be suddenly this evil dark void and neither Phoebe or Cole's baby. And the way it was shown it' was more like the Source essence or whatever attached itself to the baby as a last ditch effort after Cole let himself be killed and they should've/could've figured out a way to remove it once and for all and the kid would've been fine and Pheobe would've had a perfectly half demon boy which would've been wayyyy more interesting.

or if they couldn't save the baby at least allow Pheobe and then later Cole actually really mourn their lost child instead of it actually just being evil incarnate and not really " theirs"