I figured they decided to put the couples in the same building because it saves on production time and cost. When they had to shoot each couple in each home throughout the city, the shooting schedule had to have spanned multiple days. At one point last season we saw Dr. Pepper counseling Kate on the phone while Dr.P ate dinner or something. The therapist don’t live in the cities the participants live in. They fly in for the shoot schedule. The crew must be driving for hours to get to each person’s house, especially when they live on opposite sides of the city. Then they have to set up cameras which takes an hour or so, then the counseling session. Then the individual pov reactions to the sessions. Then taking down the equipment. Then driving to the next location and doing it all over again. The therapists must be exhausted (as well as the crew). No wonder they look tired all the time.
With them all in the same building, I imagine the shoot setup will be a lot easier. They may even try to use on nondescript apt for all the interviews. Regardless, there’ll be way less driving and scheduling conflicts. leading the therapists to be able to spend more time with the couples.
And this may just be me, but, I live in an apartment building and I barely ever hang out with my neighbors. I don’t know why the couples would have to see each other. They may live on different floors and they go to work, so they may not even pass each other in the elevator.