Faceoffs matter when they matter. It's really annoying that numbers folk can't admit that.
Sure, when you lump certain situations in with every situation, the numbers say they don't matter, but with 7.2 seconds left down by one, there is probably a direct correlation of FW to your ability to tie it up.
I just find it interesting how much possession get's stressed in analytics, yet a play that directly leads to possession is of no importance.