I'll admit that it is largely something personal, but I think it goes beyond that.
This show has never really defined any rules for what happens to Allison and the girls. In fact the the things that happen follow pretty fluid rules. Good fiction is based on a universe with rules. Although this isn't strictly sci-fi, when I was in high school, one of the first things I learned in a writing class was that good sci-fi establishes the rules by which the story functions and sticks to them. This show doesn't do that.
Further, if we have a case where any spirit can body-snatch Ariel, by precedence, that means that any of the women in the family could have that happen at any time. What about Cooper? There are others in Allison's past that could represent a threat. In fact, it becomes pretty likely that it would happen again, and apparently there is nothing they can do to prevent it. Whether it happens again is arbitrary on the part of the writers. That is not good fiction.
This show has never really defined any rules for what happens to Allison and the girls. In fact the the things that happen follow pretty fluid rules. Good fiction is based on a universe with rules. Although this isn't strictly sci-fi, when I was in high school, one of the first things I learned in a writing class was that good sci-fi establishes the rules by which the story functions and sticks to them. This show doesn't do that.
Further, if we have a case where any spirit can body-snatch Ariel, by precedence, that means that any of the women in the family could have that happen at any time. What about Cooper? There are others in Allison's past that could represent a threat. In fact, it becomes pretty likely that it would happen again, and apparently there is nothing they can do to prevent it. Whether it happens again is arbitrary on the part of the writers. That is not good fiction.