there is no defensible reason to require constant online connectivity.
I don't agree with him, but he's claiming that it would be too much work for Blizzard to not require an online connection. It's not worth the effort for Blizzard to cater to people who want to play single player in situations where they don't have an internet connection.
Which I agree, is Blizzard's position - they've already said to "buy another game" if that's a concern. So re-hashing the point is probably not worth it, you're not going to get a better response.
You are indeed right. I've already started to get that awkward feeling that my invovlement in this thread is no longer commensurate with the importance of the topic (it is just a game after all), and thus it's time to bow out.
“The greatness of a nation and its moral progress can be judged by the way its animals are treated.” - Mahatma Gandhi