A joke stand on its own without the laugh track. Watch other funny shows with gags, you do not need laugh tracks (think comedy films for example where there is NO laugh racks).
But BBT needs those laugh track and i will tell you why since you apparently did not watch one of the video. A listing of old 8 bits game without context is not funny. If I list "super mario , break out, pong" on a normal voice nothing is funny. But add a laugh track and people will start to smirk and laugh. Why ? Not because of a joke but because humour and laugh are contagious, far more than yawning. We as a social animal tend to react by laughing even when we do no get the joke.
And that is essentially why they add laugh tracks because it is a mostly unhumoristic show having a few people which are assholes to each other with the occasional light moment , and trying to paint them as geek. The humor is utterly flat so they NEED the trick of the laugh tracks.