Just to add my anecdata to the mix, I'm waist deep in logging-in to gmail and workplace apps, etc, but to compensate have abandoned android for iPhone, and I never use google search, and while I watch plenty on youtube, it's never required me to log in so I've never logged in, I don't even have any idea how much it "integrates" with other google logins or not at all. Am I missing out on something, is there some benefit to logging in?
My main complaint about youtube is that it used to be fun and quirky and have lots of "raw" content, and now everything is overproduced, festooned with graphics and clickbait. So many channels I would like to blacklist but nothing like that is possible. Technologically it works well, and I know there's content out there that I'll like, but unless I have a link to it or know exactly what to search for, it's very hard to find things. If there are channels I like and watch regularly, I sure don't need the algorithm showing them to me, but any sort of "maybe you'd like this too" seems totally broken, or at least completely lowest common denominator.
Then again, I do have 10 hour a day watch time average, my data is vast, but highly skewed
I would say it makes all the difference.
The only complaint I have is what human behaviour forces even the intelligent creators to do: have a title card with an excited looking person.