My last T once told me that at the office of one of his old mentors, everyone took off shoes and left them outside of the meeting room. I had no clue why he said that, I never talked about anything similar, it was kinda out of context.

I have no issues wearing shoes as long as they are comfortable but I like to be without them in relaxed settings. Examples: in my and friends' homes, spas, meditation places, hanging out in a park, at beaches and pools obviously... Also no problems taking my shoes off at the doctor when I need to. I sometimes change shoes at work. But I don't take them off and stay without shoes in professional meetings - for me therapy is that. I personally don't see the point - I think if I did, that would make me more uncomfortable. I also would not go to therapy sessions in very causal clothes that I wear at home or for exercise. I like wearing open shoes though and do that whenever possible/appropriate in the summer, including for therapy and business.