I can't think of a single instance where dealing with a task in the field allowed me opportunity to use a deprecated method.
On the other hand I can think of a number of times when someone with superior rank / status / standing made declarations for action that were entirely inappropriate ... and entirely ignored.
At the risk of yet.again being cryptic: the society that doesn't acknowledge the social dynamics of innovation is bound for catastrophe.
Tactic without strategy is the slow road to success; strategy without tactic is the sure road to calamity.
We also serve who again and yet again pace, and review, and pace ... and review.
p.s. Looking for something on which to impose Apture I came across something written 5 years ago: http://bentrem.sycks.net/gnodal/overview.html
... I can't help feeling it's been 5 years wasted.