In my experience, it's happenstance that varies on an author-by-author basis. I've worked in places where one author would put up a mostly text article which would be immediately followed by something incredibly creative like this from another colleague.

It's a bit of a pity really, as it would be nice to take some of the insight of the not-quite-so-graphically-gifted engineers and have them collaborate with colleagues to present it in a great accessible format, but I've not seen this happen in practice.