Good points.
Some of this is based on what I do everyday, and what I know that Mike and Dave and Ivana work on every day. It certainly doesn't feel like marketing! Heck, my Photoshop Phollies and writing-blather are what I consider to be "fun stuff," to do when I want to wind down. My day to day feels like engineering, not marketing. I'm in engineering mode much much much more than in marketing mode.
Now--thinking that the engineering I'm doing is wrong (as in, why waste time with hybrids, etc) is a whole 'another ball game. That's fine. That's an opinion. Don't like hybrids? Think that affects all our engineering? There are a ton of great options out there for you. That's the point of a vibrant market, rather than a monoculture.
(And, in the end, I think if you asked Stone if they were a marketing company or brewing company, I bet they'd say the latter.)