Y'know, after thinking about it some more, DFA is mostly just down on hangboard training 'cause he's lazy with that sort of thing. Really, like all the various things you can work on to get better, it's a matter of taste and what works for you. If you are needing to work various grips or lockoffs or whatever, then fuckin' hangboard like there's no tomorrow.
If you wanna get psyched to be a hangboard fiend, go to climbxmedia.com and look for the footage of Dave Graham doin' his thing on the hangboard. It'll either get you way stoked or make you never want to look at a hangboard again, knowing that you will never in your life be able to do anything remotely close to what DG pulls off.