We've been talking about of the rumored "fake" crowd noises during the upcoming NFL season if the league proceeds with the season without fans in the stands. I started thinking, most TV sitcoms which famously used a laugh track or "laff box" as they're called, really don't anymore...so why is that?
According to Cheddar, Fake laughing on TV shows stems from the change from a one-camera style of sitcom with a studio audience really laughing and the actors doing multiple takes of the same scene, to the more modern three-camera system in which three different camera capture the same scene, and then editors going in a cutting the different takes together. This three-camera system caused the audience laughter to be inconsistent and in the wrong places...hence the "laff box".
In recent years, a lot of sitcoms like Modern Family and Parks and Rec have forgone audiences altogether.
Check out the explanation here...