If you're a publisher, journalist, author, blogger, musician, artist, designer, cartoonist, or any other sort of person whose job it is to connect with people by communicating ideas, it's natural and wholesome for people who are interested in what you do (and many of whom are certainly makers-of-stuff in their own right) to develop a relationship with your work and to want a way to participate in it, add to it, and build upon it. It's equally great to reciprocate in a way that's collaborative, fun, and useful. God knows, it's anybody's dream to have people interested enough in what you do to find that they want to reach out to you. Talk about a first-world problem.

Over the years, novelist Neal Stephenson (wiki), has had at least a couple different pages where he's explained why he's chosen to limit the access he provides via email, interviews, and phone calls. It appears to be something he's given a lot of thought to.

Via Jessamyn, here's an Archive.org mirror of an older version of his page where he explains his introversion and need to stay focused on his work, alongside FAQs that answer many of the questions he typically has to field. Read it all though. It's pretty good. Stephenson's bottom line?

I simply cannot respond to all incoming stimuli unless I retire from writing novels. And I don't wish to retire at this time.

And here's another well known piece, Stephenson's "Why I am a Bad Correspondent", in which he lays out more details about why he's chosen to create an expectation based on guarding his attention so slavishly: