I don't really mind the layout changes and such, it's pretty normal for a website to update their look every now and then. The reasons I voted Yes is 1) because of the increase in ads, which has slowly but surely grown to a very annoying amount. But even that I can forgive, because they, like every other business, are out to make money. I get it.
But the second reason and more important reason is the COPPA (i think that's how it's spelled) thing. I understand making YouTube safer for kids, but the algorithm that has implemented it is horrible! I have seen many videos marked as YouTube Kids that *should not* be listed for kids. Above all, I cannot believe that it deletes the entire comment section of marked videos! For some videos, that's over ten years of people's reactions, jokes, and of course, stupid shit, that has been erased! As someone who really values how comment sections and other such things archive people's words, that is nonsensical to me, and I really don't approve.
Just think about how it disproportionately impacts the archives of our fandom's history. Many important songs and fanworks in the brony fandom have been marked for kids on YouTube, deleting the resulting discourse (used here not as a term for arguing, but just as a term for conversation or remarks) between fans in the comments. Ugh, I could go on, but that's an essay for another day.