I write (technical) articles and develop software.

Good devs can be bad writers and the other way around. But good code is as good writing. It's a planned endevour which takes a few iterations to get right.

Most people who code bad and/or write bad are doing so because ther code and text are just streams of thoughts typed down as they had them. Sure, iteration can fix a bug here and there, but if their thoughts don't follow a red line, nobody can understand what they wanted to create.