I also have never been attached to a T or Pdoc, well, at least not yet. In my case, I got used to absence and being absent myself, I'm kinda unable to connect in a deeper level with everyone, I guess. I don't think there's a rule that we should all attach to our Ts, but I think that maybe for some people the T gives them something they longed for and never had(like receiving honest support for the first time?) or T replicates some good relationship from the past(not consciously but naturally and even effortlessly?) and so people hold on into it. But it's just a theory of mine.