The best technicians don't usually write in blogs
If you are a good programmer and you got the lucky to be paid for your job, surely your work has to be private.
If you are a good programmer and you got the lucky to be paid for your job, surely you like to test new technicians skills, as program languages, or doing new private scripts for your home.
If you are a good programmer and you got the lucky to be paid for your job, surely you haven't enough time for all you want.
If you are a good programmer and you got the lucky to be paid for your job, surely you don't want to waste your little spare time to write in blogs because you get tired.
If you are a good programmer and you got the lucky to be paid for your job, surely as soon you finish your objective, you look for a new one, so it's not attractive to waste time writing about past things.
So, unless you got paid for writing in blogs, the best technicians don't write in blogs.