However (and yes I can't believe I'm saying this) I think everyone at some point (hopefully) reaches an understanding of one of the most important underlying reasons for limits - protection.
I am an abuse survivor and my non-abusive (or less abusive parent more accurately) never protected me against the cruel horrors of incest.
For most of us being female, our fathers were either the abusers or those who failed to protect us from such atrocious and damaging experiences. This goes against one of the father's most important roles with his daughter - to PROTECT her. To guard her innocence, treasure her feelings and her unique self. Even when she rails against him, a good dad holds firm. But this also needs to be balanced with a melted butter sense of love and tenderness for his daughter when she is distraught, frightened or confused.
Getting back to therapy. Any good therapist needs to hold some firm limits with us. Even when we rally against them, get rageful, throw tantrums, hurl obscenities, we NEED them to hold the boundaries so that one can learn that they are worth the effort. One is worth and deserving of protection.
However unless it is balanced with real care, acceptance and tenderness, it comes off as authoritarian, rigid and controlling. As we all heal our hearts in therapy, we are more able to take in the love of a good T and when that day comes, those boundaries don't seem mean anymore. They seem like the most wonderful gift. Because no matter what, we are finally safe, loved and protected. Free to trust. Free to be who we are knowing all the time there is a safety net underneath that can never be destroyed.