Interesting video. When the Prophet 12 came out in 2013, I was not looking for a polysynth, so I never even seriously considered it. These days, I think it would have made my polysynth short list* in place of Hydrasynth. I was considering only instruments in production.
Of course, that's the real answer to the question "Why doesn't anybody talk about the Prophet 12?" It doesn't mean it's not well-regarded. It's just pushed aside in favor of new things. It sounds great, and there's a lot to like about it. I wish I could have had the opportunity to try one out.
I did think it was kind of ridiculous to show the clips of Dave Smith saying that the Prophet 12 was his favorite design. We all know marketingspeak when we hear it. I'm glad they circled back on that idea near the end.
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* The short list was Take 5, Trigon 6, Prophet 5, and Hyrdasynth.