We have never changed tables. Usually we have been quite lucky. Our last cruise was a little odd. We had a table for eight. Four very close friends plus our group of four very close friends. We got along okay but were a bit tired of them after fourteen nights. I think the dynamics of two sets of four very close friends made interaction a bit strained at times.
On another cruise we had a coocoo clock repairman that was heavily into drugs. He came to the table stoned each night. He and his wife were very annoying.Conversely, the other couple at that table were very nice. They were both doctors from Jordan and were quite interesting.