The problem (if you want to call it that) with following
a person on sites like Bluesky or X is that people aren't machines and won't stay "on topic" regarding the reason you followed them in the first place. You might follow them for software dev, biking, birding, or whatever, but one day they could suddenly start ranting about their own political opinions or crazy beliefs.
IMO, Reddit/HN-esque sites are better for following topics, and Bluesky/X/Mastodon are better for following people. Maybe hashtags are a good middleground but I don't have enough experience using those sites to say.
(Disclaimer: I don't use any social media except for HN.)