As social creatures we respond well to certain social cues.
Laughing is kind of contagious, when other people laugh we aare more likely to laugh ourself and the laughing itself releases certain neurotransmitters and hormones that make us happy/feel good.
So by using a laugh track, they trick you into enjoying it more.
We’re complicated creatures and those social cues may be ignored for different reasons, but it influeces us a little.
A show without a laugh track may not be that funny to us, but hearing others laugh encourages us to do the same.
They actually started as you mentioned when more and more shows starting being pre-recorded. One of the early purposes was to fill in the laughs if the audience missed a joke. There is actually a laugh track machine with different types/volumes of laughs assigned to different keys. And as someone else mentioned, many of these laughs are old recordings and you can hear the same laughs on different shows.
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