but this requires setup / system integration / maintenance and additional attention (time) from the devs that they could be spending writing code.
Setup, sure. But I think it's worth the setup time/effort.
With proper use, I actually think it will save some of the developers time, Think of the time wasted on making changes to the crylink that they will end up having to change again later due to community outcry. That time could have been saved.
The contribution and maintenance of the blog can be done by volunteers that aren't the developers. So divVerent doesn't have to change anything that he's doing aside from occasionally explaining something with more clarity when asked (which he does already) because often the SVN notes don't make much sense to a casual observer.
The difference is that he would only need to explain something once. I see Div spending time on the IRC channels explaining things a lot and updating people on various aspects of Nexuiz. In theory, he would need to update only one person instead of 20 people.