I read your blog on a daily basis, Jeff, and I find your observations clear, entertaining and almost always insightfull. I'd say about 85 - 90 percent of the time I completely agree with you. Not on this one.
"a blog without comments enabled is not a blog. I'm not sure what it it, exactly, but it definitely isn't a blog."
Well, of course, that's according to you. That's fine. That is what you believe and I respect that. However, your opinion of how a blog should be defined -- how it should function -- is not the hard, fast rule for all bloggers.
If a book has the front or back cover torn off is it still a book? If a magazine you buy at the store refuses to accept reader mail does that mean it can be classified as something other than a magazine? If I choose not to show my email/homepage when I comment here does that mean my comments aren't valid.
Definitions can be great. They can also be a way to suppress. Let's keep the definition of a blog loose for now. Many people blog because they find comfort in the loose and open format of it. Initiating "rules" and "definitions" would take away from that. I'm more than happy to "allow" people to post blogs where all they do is throw their opinions out into the universe.
I love the fact that you, Jeff, want your readers to comment. But not everyone wants or needs to allow for that.