If this is real (I am a Millennial but I don't actively watch/use Tiktok to have seen it), I think that it might be a learned habit from using tape and old slow digital cams. Especially tape since it does need to get moving. Though old digital cameras also have a much more noticeable delay than basically any modern smartphone. Go watch old internet videos and you will also hear the camera person say "go/okay, go" like miming how shows and movies are clapped. Could it be trimmed? For sure.
I think you mean "innovation." As it seems that things that were stolen years ago are now "new ideas" again. All the fake reasons that companies feel the need to make weird and pointless changes to things. Just to then un-do those changes in a few years and act like the shit they were already doing before is some mega leap forward. The changes allow folks that really really want to climb the latter fast as fuck with putting their spin on things that make worker's lives suck with extra nonsense BUT sound somehow amazing on paper to the bosses (that also tend to not know how the shit works to begin with at this point) for promotions. All before shit breaks and they then re-pitch the old shit as "making the business more streamlined." So many of these companies feel like they "need" to change their logos and act like it is some super deep meaning (though in Elon's case it is likely both "deep" and for laughs/"dunking" on someone somewhere). But they all just end up copying each other in major design elements. Like Google's weirdly proportioned and oddly HR looking cartoon people are in HR e-learnings I have to take at work and across so many IoT brands and services.