I wouldn't like it one bit, but I think it is okay to do so. When I was a kid, I waited with my dad in my mom's shop every time she worked, so we could go for dinner after. Ts have a life, and people in their life should be allowed to pick them up from work. They waited in the waiting room, designated to be waited in. If they knocked and told the T to hurry, that'd be different, but just waiting somewhere is fine.