Backseat drivers...
If it was off, you'd want it on.
No. He was making a legitimate point about a bunch of lazy-ass pilots and cabin crew. There are some paranoid types out there convinced that "they" will hang them if the seat belt light comes off and we experience a ripple--give me a break!
Then there are the cat-herders just aching for an excuse not to serve pax so they can sit their lazy-but-large derriers in the js for an hour and a half, reading Vogue, Cats Today, or something else.
Bottom line: if the plane is at cruise altitude, and the flight is smooth, turn off the seat belt sign and let folks stretch their legs and hit the head. Would you as a passenger want anything else?