All the writing style and organization in the world is only to get people to read something. If he's gotten you to read it, and you will continue to read what he writes next, he doesn't need to work on all that stuff anymore.

Organization isn't to make the reader's life easier. Making sense of what one reads is largely an introspective activity. No matter how well-organized it is, you the reader have to regurgitate into a form suitable for yourself before you can digest it. This is called active reading.

I don't find "walls of text" at all forbidding, as long as the line width isn't too long. I also find Joel's argument on this point a bit dubious:

When was the last time you noticed a popular magazine or newspaper with entire pages of text?

True, but books do it all the time---as does Joel's essay, except for the gratuitous pull quote in the very section under discussion.