"Coffee without caffeine is not a coffee. Essence has been removed."
This comment perfectly illustrates the problem with your position.
MILLIONs of people drink decaffeinated coffee. So for them the "essence" is not caffeine - maybe it's the taste or smell or something else.
The people who insist that a blog must, perforce, have comments never explain or justify their assertions. Their reasoning seems to boil down to "because I say so". Or it's social convention: the way some self-apointed village elders look askance at anything that violates the customs and traditions of their little tribe.
The inability to produce a more compelling argument is especially striking because bloggers are (supposed to be) writers! They are supposed to be possessed of the skill to communicate, and to organize their thoughts into a structured and compelling argument or story.
So why do so many bloggers become positively apoplectic about blogs which don't accept comments, or which moderate them down to a tiny few? Why can't they put into words any reasons for this belief that don't reduce to a Fiddler-on-the-Roofish "Tradition"? Because, boys and girls of Anatevka, maybe comments on a blog are about as necessary as a fiddler on the roof.