I think Ts should treat each client as an individual and adapt the session so that it helps the client. For example, if a client is doing trauma work and is getting triggered right and left, the T should go more slowly. Another client might be able to do the work more quickly. So yes, Ts should make allowances for individual variation and adjust accordingly. I don't think a rigid T does anyone any favors. I work in mental health and we especially make allowances for communication issues. Recently there was a client who was deaf and could not lip read. We provided her with a sign language translator. Similarly, I have worked with clients who speak languages other than English and we got translators for them too. We get a lot of clients with Axis II traits and have received training that recommends providing firm boundaries with this population. So we adapt there too.