Original sitcoms were more like plays and filmed in front of an actual audience. Laugh tracks were inserted later to help make the show seem funnier.
You maybe have seen the famous example of [Big Bang Theory without a laugh track](https://youtu.be/8ib889nSZVU)
Nowadays, comedy has evolved as well as storytelling. Shows don’t need to rely on laugh tracks anymore.
However, there is a revival of live studio audiences for some sitcoms. A lot of the audience is made up of writers who worked on the show and who didn’t but, they also allow fans to go to viewings.
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