Fixed seating is quite popular with many guests. One has the same table, the same waiters and sommelier, and the same group of fellow guests each evening.
Advantages, if so desired, may include:
One's wine is already waiting.
The waiters quickly learn about your preferences, allergies or any other needs and wants.
One can build up a closer relationship to fellow guests and have more meaningful conversations.
Everybody is on the same schedule, no coming and going of guests all the time.