Your T sounds a lot like mine. Boundaried, accepting and very competent. Just like you I have feared the feelings I have developed towards him because I am scared of him not being able to handle the intensity of my feelings/yearnings and doing something that hurts me. Getting vulnerable is super scary (especially after a hurtful relationship with T1 where self-disclosure and general lack of boundaries were hugely painful for me).
I know next to nothing about my T too and have been uncomfortable on the couple of occasions he has mentioned anything, though I haven't said anything because it's vague and rare. Like "I went to a restaurant like that once". It still scares me though because of my past with T1.
I did speak up about one thing though - one session he seemed to be covering his mouth for the whole session which really bothered me. Like he was hiding his expression (I do the same thing for that reason so maybe that's why I thought that) but about 2/3 way into the session I said "there are still lots of things I struggle to tell you, like right now it's really bothering me that you are covering your mouth but that's hard for me to say to you". Framing it like that made it easier for me to say. (I spoke about my loving feelings towards him in a similarly 'third person' way).
He was fine about the mouth thing and just removed his hand and we talked about my tendency to do that to hide my emotions.
So I guess if you are curious about why it bothers you so much, broaching it with him might be helpful. Another technique I've used is to write things down in third person "It bothers me when he...and I feel like..." and I read it out to him as though I'm talking about someone else. Takes the sting out of it for me, and I don't know whether this or something similar might work for you.
I'm glad to hear you have a good T. I hope therapy continues to be useful to you.