I think this feature can be used for various purposes, however, I don’t exactly understand how different this feature is from using a (backdated) post for similar purposes, as I currently do. The Blogger engineering team should be commended for adding this feature, since it makes more choice available to the publishers, but for bloggers familiar with HTML and CSS, this feature looks like a marginal improvement. Perhaps there is value in shorter URIs, but I am not totally convinced of this either.
May be this is a small step in a bigger movement towards making Blogger more than a blogging platform? It would be great, if this were a start of a process to afford even greater flexibility for users by combining blogging functions with elemetns of traditional website pages.
Or have I missed or overlooked something, and barking up the wrong tree? Yes, probably.