You're running a delicate balance when you design your restaurant facilities to move people out quickly. It works fine if you have a captive audience. The messdecks (eating space) on the ship I was on in the Navy was once painted a hideous orange that was created, so the story went, by mixing the two main primers the Navy used, red lead and zinc chromate. When we were out at sea there was no place else to go and in port they were saving money by driving customers away. In a restaurant that has nearby competitors it would seem disadvantageous to make the surroundings uncomfortable.

"Shall we eat at Denny's or Friendly's, dear?"

"Oh not Denny's; their food makes me ill for some reason."

In a mall food court you're on the line. It's often easier to eat there rather than go elsewhere but.