One of the advantages of custom domain publishing, and the domain root to published URL redirection, used to be transparent redirection of the URLs. As Blogger blog owners become more sophisticated with their blogs, and custom home pages (aka "landing pages"), become more popular, we have blog owners with concerns about home page access and domain root redirection. We are also seeing concern with direct access to specific posts - with posts advertised, using the domain root URL. In some cases, redirection only shows the reader the blog home page, as the first view of the blog - even with a specific post being linked in the advertised URL.
What Blogger won't tell you