[HuntsvilleTxVeteran]

"He said: "The big question is whether the customer is happy. Already, when I take a ride on a big 747 we have to wait with a lot of people in the lounge and boarding is a crazy stress. Baggage and passenger handling is chaos." "

He is correct about so many people deplaning at the same
time.
It is really bad if you have to go through customs.

[Arkie2]

Interestingly, the Japanese use a large part of their 747 fleet as commuter aircraft between Tokyo and other cities in Japan. They would use the A-380 in the same role if they ever bought it. Still, boarding and deplaning an aircraft with 800 people would be very time consuming under the best of circumstances.