Perhaps the blank slate approach works better for people whose primary concern isn't relational, and are therefore less likely to focus on the therapeutic relationship?

Idk, my T seems to have a weird stance on how much of herself she reveals. At one point she told me flat out that she wouldn't ever tell me about her emotions (i.e., her emotional responses to me) again because that would make it about her and not me. While I appreciate the intent (now), I think that she fell back on some therapy dogma that was so not therapeutic. I also think she did it to protect herself.