"rolling laughter" is a technique you have to learn as a live performer for a reason. TV shows at the time had to bridge the gap as the 80s/90s invention of stand up as an art form set the tone for how comedy should be.

It's not that it was always bad, it's just that culture changed. Same as how a Jacobite audient would find it real weird we watch theatre inside(!), sitting down(!!) and not talking during the show(!!!).