Even aside from the questions answered (which were far too few) I noticed cKnoor being dismissive and slightly insulting towards the established community which is never a good approach.
But even ignoring that, I think there were many things that made this Q&A worse than the HBS ones.
With regards to the the questions he did ask, he added to, rambled, and rephrased the question being asked so much that that few got answered and were done in only the broadest possible sense with no interesting information was introduced. You could see Mitch's attention wandering as he waited for the actual question (or receive direction off camera?)
When Mitch read the questions in the past, he would read it as written or shorten/condense it without losing the thrust of the question, but he got to the point.
In the Q&As that HBS ran, this let them answer a lot of questions, and even if some were repeated from previous areas, at least they acknowledge and answered them quickly. You also got to see a lot more about the devs as people not the standard filtered Q&A we received today.
They would have covered the questions asked here in a few minutes, gone on to more detailed ones, then asked a series of rapid fire one-shot questions, then looked to chat.
HBS Q&A was also more focused which gave more direction and focus to the questions asked.
And finally, one of the biggest things. The HBS Q&As were about connecting with fans, this Paradox Q&A comes off as feeling like the most basic of manufactured and controlled PR.