The reason to follow many developers is could be due to their useful output (e.g. informative blog posts). You don't have to agree with everything that someone puts out (cult of personality) to find things that they produce useful.
There are developers that I have met in real life, whom I didn't really like their personalty, yet I still take notice whenever they put out a new project because they usually have well-thought out and infinitely usable interfaces.
But supposing everybody took your stance we wouldn't be able to have something like Hacker News. I think following popular developers and sharing what you believe to be good content may not be enjoyable all the time, but I do think it's necessary. Just as someone who has only been in the software culture for about two years now.
Because most of them don't have time to write frequently. The people I follow tend to write once in a blue moon, but when it happens, the articles are really good and I consider it a shame to get lost in a sea of noise.
If I open my RSS reader right now, I'm sure to find 10 good articles that I like, which is not what I can say about HN on any given day.
In fact on HN I'm glad to see an item worth my click once per month. The content promoted here is really bad IMO and I only come for the discussions, which tend to be interesting as people bother to post long comments.
I find that it is better for developers to go through the exploration of ideas and to come to their own conclusions/path on the ideas that works for them. Encouraging that academic learning is much better than recommending a specific person for people to dump their time listening to.
It's a decent starting point for those just starting out in the community/open source culture to get the hang of it.
The general idea however is to keep an eye out on places like HN to general trends and follow popular/radical repositories in those areas.
However, I would strongly suggest to not fall for the trap and limit yourself to just following people / news. Get the news but dig deeper, read posts on that topic, clone and play around with repositories, create and share small projects, connect this to what you already know and create ideas, no matter how useless you think it is, read influential papers (re-read them) and get involved in conversations on them.
That is more fulfilling and impactful than following personalities.
You don't have to, but, it's probably a good thing.
In that case following his blog explains how he made that good stuff which helps in building skill and also helps others to build great stuff.
For example when I see a new thing by antirez on HN, I am likely to click it because it's usually good stuff, but I am not going to be following his blog, etc.