With my ex T it took me two years to realize that I was the only client she was emailing with. I was completely stunned. The fact that she only allowed one client (myself) to email her was actually very damaging because she started to resent it which eventually led to termination.
Nobody has brought it up but what about fairness? How is it fair to other clients to have favourites? Because that's what it is: giving only certain clients some priviledges over others is playing favourite. I don't think it's healthy at all: neither for the client nor the therapist.
Sure it might feel good to feel special but how would you feel if this was the other way around and you found out that your therapist had extended priviledges to some clients but not to you? Imo all clients should be treated the same. I know people here will disagree.

I'm absolutely certain my current therapist does not treat me any differently from her other clients: no special priviledge, no outside session contact, none of that. This is better.