While the idea behind it is solid, the problem is pinpointing locations for specific points behind that takes a while to find, and considering the community chats are generally right after the rumble finishes, there isn't much time to find those specific markers. In addition, twitch vods are... well, flaky at best, and I think it takes Urz usually until at least the next day to chop up the local recordings and put them on youtube, so those wouldn't be available to draw from either. Sports channels have personnel they pay specifically to find and cut to things like this, something we don't really have the luxury off, especially if it's for the chats that are right after the tournament ends.
I don't disagree, it would be nice to have something like it, but in a more practical sense it's not really achievable. I'm not going to say it can't be done, nor do I know what Urz would think about it, it's just what I know from my broadcasting experience.