A huge thanks for posting that interview. Loved reading it. Very interesting stuff. I'm a big Phish/Trey fan, so I'm biased, but it's really interesting to hear more about the techniques and approaches he and the band have used over the years to improve their improvisational playing.
Also fun to read more about their non-set list approach. I've seen several shows over the last couple years, and at some shows thought maybe they were using a set list, but usually could see the pick-a-song-on-the-spot communication they do... as he talks about in the article. Amazing that they can pull that off so well.