I had done a best-of video twice before (see Best of Seat Cam 2009 and Best of Seat Cam 2008), back when I was riding around with a Flip Mino jury-rigged to my bike. A lot has changed since then, as Flip went out of business and every yahoo in the world has a GoPro now. The general novelty of "it's a camera! on a bike!" is no longer all you need to capture the cycling world's attention.
(Seriously look at how terrible this video I made six years ago is, and it went viral anyway)
Anyway, editing 20 hours of race footage into a few minutes is a lot of work, and trying to make it look good enough you're proud of it is even more work, which is probably why I hadn't done this in five years. But now that it's done I'm like, "I should do that every year." So maybe I will!