yeah but they're not a game changer. they were a simple convenience to do correcting of work that had some sort of typo or wasn't proofread/add a tidbit of information. has nothing to do with the actual quality of the content. it benefits people producing the content. annotations would be very situational for TV programs, but in the end, what do you really need to add in a tv annotation? an end card saying to subscribe to your channel? to expect a new episode January 1st? that you're going to livestream a video game? that you forgot something in the episode (acceptable in youtube videos but not in major tv productions)?
annotations were a somewhat trivial thing, even if some amateur video productions were to ride off of their existence. though i don't like the idea of them being gone, as channels have much more use for them than tv shows
tl;dr: lift your tinfoil hat. there are no advantages to annotations on a grand scale and this isn't the start of some big youtube war