"User friendly". Yes, for you, the author. At the expense of everyone reading your blog. When considering this is a one to infinity relationship (i.e. write once read a million times), focusing on optimizing the "write once" at the expense of the million times it gets read, might just well... cause it to be read only 10 times instead.

I wouldn't even bother reading a PDF and I am on a desktop. I make some exception: Books & Papers, device manuals and legal documents & the like.

I would never read a blog in PDF, unless it's the last blog on earth.