Good post, and opinions actually. Of course he doesn't bring up the point that it was Roberta Williams who pushed the 3D thing! But we must remember it is her 'fault' (if you find it a negative!).
On the other hand... If 3D games were never made because they were 'ugly', and "3D wasn't ready" at the time, we may never had progressed to 'better 3D'! It's the early 3D that were used as testing tubes that lead to our modern HD 3D!
He does bring up the excellent point that even if KQ8 came out 2D it would have likely been a flop, because the main gaming audience had moved on to faster more exciting material.
BTW, IIRC. John Shroades was the art director early on in production? He left early, and art went to someone else. Most of John Shroades work in the game was cut IIRC, and reimagined. Only a few things like the frost demons more or less remained close to how they appeared when Shroades was involved.
So this post does give us some interesting insight into why he left!