It's applicability to modern aviation is so marginal at to make it worthless
Maybe in what you fly. But even working for a UK company I found alot of it useful.
If however, you start working for a company operating in the past (and/or Third World) then your knowledge is still wasted because you'll still be doing it their way.
Nope NAV doesn't change neither does the technical. And if you bust an Annex and pick up pax in the wrong place you could end up in some ****e hole prison praying that the company man will spring you and they won't just send another crew and get the plane and leave you.
Maybe if AF477 pilots had actually understood what they were doing and the principles of flight they would still be alive.