Not much. I like the variety; think it adds something to the site; and I think it helps the author as he tends to mix things up a little more than just with the thread. That's all.
Just as readers need variety, writers like to keep things fresh too. I imagine after 70-odd posts the LA might be a little tired of doing the same-old same old.
I like the variety. If I want one thing, I go one place. If I want another, I go there. I think more blogs should be grouped in similar fashion, but not in the massive groupings that are common!
First, about groupings. I like technorati. Good groupings there, helps you find what you want. Second, I like it, because more blogs meen more posts to read on a weekly basis. How could that be bad?
oh and
--Carpe Carp!!