Full disclosure: I didn't watch this video. I generally don't watch in the bag segments, but sometimes I do. What I enjoy is watching somebody who makes a living at this game and has access to all the new discs pulling some old dependable disc out of the bag and thinking "oh, I remember those" or "hey, I still bag one of those, too." It's kinda entertaining to watch pro disc golfers act like a chucker and keep an old disc in the bag.
A Dynamic ITB gives none of those moments because none of their discs are very old. It all shiny new stuff and it just doesn't hold my interest. I try not to poo-poo on the threads because it's personal preference; if you like Dynamic and want to throw their stuff more power to ya'. I just generally pass. I would have passed this time, too. You asked, though.