Those people sure were amazing, though. I talked to a musician/programmer, who spent the last few years writing his own sequencer web app, and did an amazing live performance in his web browser! I witnessed another guy live coding a synthesizer in a web app on stage as a music piece. We attended a gastronomical concert with smartphone-synchronized distributed olfactory and audible experiences. And we played the piano, with each participant controlling one key from his smartphone. It was all truly inspiring!
Then again, limitations breed genius, and the limits of the platform no doubt fueled the amazing feats these web audio people pulled off at WAC. It is truly inspiring what miracles dedicated people can pull off if they set their mind on them. And let's not forget that the Web Audio API itself is the work of a single person (per browser) as well.
So, in summary, I learned a lot at WAC. I learned that web technologies are not ideal as an application platform. I learned that deep framework stacks are not desirable, yet often necessary. But above all, I learned that all this does not stop people from writing astonishing applications with those technologies. More power to the crazy ones!