I think it has something to do with this current culture of 'personal branding', wherein a lot of content online aimed at beginners says you should be blogging, writing articles, basically telling people how to do the thing you learnt that day on dev.to, blogs, Twitter, Medium, etc. I don't think it is necessarily bad per se, but it all seems a bit useless? I think there is good value in writing a personal blog, a log of what you've learnt coming from the perspective of a learner, rather than a teacher.