Although the web seems to be easier for posting knowledgeable essays compare to 2000s, why are there fewer personal websites and some recent human knowledge (opinions ...) are behind wall-garden?
It's quite easy for a tech-savvy guy to start running a jamstack in no time. But is that becoming really easy for an accountant or a barista? to share their experience as easy as hitting tweet button or What's on your mind textarea?
Tech is unique in a couple of ways:
1. It's a very young industry, so there are no set ways to do many things yet, which invites people to experiment and then write about it.
2. Unlike many other industries, in tech you can experiment using just your at-home equipment.
3. Older industries arguably expect their practitioners to be more mature, so you're less likely to see a structural engineer writing about his weird ideas on how to build support beams... Whereas in tech if you blog, even if it's BS, it is still welcomed.
4. There's plenty of money in tech and the blog can help you get to the highest paying roles. (whereas in for example architecture it's much more about just seniority and years on the job).
Also I don't see many traditional professionals as wanting to reach out and I find it enjoyable, and remunerative.
I have a wordpress blog (found via bt w3 site) and two twitters so not too walled that helps me reach out and be more findable. Self-hosting would take me too long to read up on as seem to be many options but I suspect most are unfit.
And they don't know how to blog, and they have no idea that this would be free.