Read up on restarting Stinger production. Retired engineers had to pitch in to train the current generation. So I wouldn't say "totally fine".
There are always going to be bits of technology and training that seem to no longer be needed for modern products. And sometimes, some new product will need to resurrect one or more of them.
The idea that there's an "active program" to train people on literally every previous engineering practice ever created isn't feasible.