Yep, there are a lot of ways you can do it. The point is, what are the chances my accountant is going to have GnuPG already installed on their laptop versus MS Word?
None, is the answer. There is a none percent chance. And if you're going to get someone to install something, it's not going to be GPG. Without loss of generality this applies as well to lawyers, IT managers, development leads, chief security officers, cryptographers, and some former PGP developers.