Just got off the Sky and while we were in a Suite our one friend was not. We went to dinner around 8pm and there hardly anyone in the reserve section and no one came in after us. Reserve section and regular dinning room check in was the same place. When we walked up they were ready to seat us in the Reserve Collection area until we told them we had one companion not in a suite. The suite host turned around immediately and pointed us to the "regular" line (we were the only ones in line.) In fact they referred to us as "Sweet, Sweet, Sour" and were told until we get rid of "Sour" we were to eat in the main part. We laughed but it did come across as a little rude. We never expected to sit there and were the ones that told THEM. I still don't understand why they wouldn't let us sit there as there were plenty of tables and not one person sat down after us but I get it. Again I didn't expect to sit there. We even had the same waiter as the Reserve section as he was working both. (and he wasn't that great!).
But to the person asking about a window seat, at least on our cruise it would not have been a problem to get a window seat every evening at time of night.