The problem with that is therapeutic relationships don't exist irl.

Therapeutic relationships are often emotionally intimate. Yes, friendships and romantic relationships can be emotionally intimate too, but not usually where you "bare your soul".

Plus in a therapeutic relationship, the other person isn't coming to you for help, support, or encouragement. You get to receive it all. Irl relationships, there is a give and take, but not in a therapeutic relationship.

Boundaries are hard to change. And normally, if a relationship goes from therapeutic to friendship, there will be even more boundaries because the T has knowledge of very personal information.

Also, it is difficult to change the dynamics of any relationship. Best friends start dating...divorced couple become friends...these relationships are possible, but are rare. Going from T to friend is possible, but difficult and rare.