I arrived in February, so I had no experience with the “old Medium.”
If you select too many topics of interest it would be hard to keep up. I only selected 8 of all the possible Medium topics as interests. I like the idea of my feed focusing on a small set of topics I really like. I can always click one of the other topic links if I feel like something different. But I really don’t want Cryptocurrency or Startup or Marketing or Cybersecurity or Pschyedelics or or (you get the idea) in my feed. Which they used to do all the time with “Editor’s Pick.” This new feed is much better in my opinion.