The video is available on Youtube. I would suggest watching it. Then watching it with the sound turned down, looking at the graphs and asking "Which filesystem looks best for *my* workloads?", at each step of the way. Even with all the new improvements to XFS, and despite the common disparagement of EXT4 as being old fashioned, EXT4 still beats XFS handily in Chinners own graphs for 1, 2, and 4 threads. XFS's domain begins at 8 threads. Why do we need EXT4? The question is almost absurd. We need it because it's still the best fs out there for most machines today and for some finite time into the future.
Sometimes I wish that certain people could get their heads out of their Fortune 100 Datacenters for a bit and take a look at how the rest of us live.
For balance, I'd recommend Avi Miller's "Best of #1" talk "I can't believe this is Butter", about btrfs. One of his messages is "use the right fs for the job". Far less defensive, dismissive, and confrontational than Dave Chinner's talk. And perhaps a bit more pertinent to those of use out here managing a few Dell T310's without fancy petabyte RAID arrays.