Come on now. You are 30-40 years removed from the content you're watching. Would you be comparing the cultural trends of 80's American TV and 2020's?

Much of the development of modern anime genres happened after that period. Some genres that were popular back then e.g magical girls have died out and were replaced with some parts being scattered and found elsewhere.

Its more common because there are a lot more anime being made, at least 10-100x more per year. Its more common in absolute numbers because you can find a lot of niche crap that barely anyone watches but still gets made.

But as a proportion its not realy more significantly different from the past 10-15 year trend. Anything before mid 2000 is an entirely different industry honestly.