Google is beyond broken. Chasing those engagement numbers on a forever treadmill, just hoping they inch up a little more at any cost.
I went through a "This Old Tony" binge a couple months ago because i stumbled upon one of his videos and youtube kept recommending more. But that seems to be the exception rather than the norm.
Now, thanks to the all powerful algorithm, I can watch a video about a rescued pitbull living with his new family, and have it followed up by "10 times Ben Shapiro owned the libs".
In general I find the selction on the homepage to be useful, however it does take some work as I regularly remove a lot of random things.
I also open random videos in a private window to keep my watch history more focused.
So it works fairly well for me, bringing up videos from channels I like that I haven't seen before... but it takes effort to get it to work for me. So it is arguably not very good for a typical user.
Currently I see absolutely zero related content next to the current video I’m watching, from the current user or the subject matter.