I'm not sure it's the feelings that are the problem. It's that they might motivate actions that could harm the client.

I mean, I suppose it's possible that my T might secretly think of me as the daughter he never had (eww)--and, hey, that's fine, I guess. He can do whatever he likes in the privacy of his own brain.

Still, I'd sort of prefer he didn't. It would make me nervous that he'd lose objectivity, refrain from telling me some difficult truth, or, made uncomfortable by his own emotions, pull away from me. For example.