Sometimes I just want to know "what is popular on youtube right now? What is it that the world is watching?" and Youtube won't tell me anymore. The algorithm isolates me and my preferences from consensus reality. Youtube doesn't want me coming out of my cave.
Have you tried the Explore feed? Mine has Music, Movies & TV, Hype, Live, Gaming, News, Sports, Learning, Fashion & Beauty, Podcasts and Playables. Most of those have some sort of subcategories too. It appears to be regionally determined - I don't see any influence from my data here