Not really related but... have anyone else noticed that suggestions on the home page became much worse recently? I'm getting a lot of unrelated videos which are often very old, like published up to 18 years ago. OTOH, videos from subscriptions are not getting suggested, I often have to check individual channels to see if they posted anything new. What's happening?

If you pay attention, this happens every few months. This is youtube tweaking the algorithm.

Every time they tweak the algorithm, content creators scramble to figure out what changes they made so they can exploit it. That's why every few months all the major channels change their styles to all be the same. Gotta exploit that algo!

Use the subscriptions page for the channels you follow. I use Unhooked to make it my home page.