Creating a Blogspot account and using it is already much less work than setting up a custom blog.

It is not just how much time you spend creating the account.

First, there are decisions involved (what service to use, what design to use, whether customize the design, how to call the blog,...), which would all be removed by someone telling you "send me the document, I will publish it; see, other people are using this service too".

Second, by creating a blog you kind of precommit to moderate spam and trolls in your comments. Unless you want to have one of those blogs where the first 10% of the page is the article and the remaining 90% is spam. But even if the discussion is reasonable, you kind of precommit to read it and to respond.