Hmmm
I haven't watched many sitcoms recently. I felt like those pauses for audience laughs were often where they'd cut to other camera angles anyway (likely to distract from how unnaturally long the characters paused in the middle of their conversations)... But I don't have any concrete evidence to back up my feeling.
I recently watched a video by Jason Pargin, about how pretty much all TV shows are Lost-ing it, due to how modern TV production is done. If you don't think they're Lost-ing it, it's simply because the writers are doing a good job making it up as they go.