It's the taking engineers out of retirement that's deindustrialization. A properly industrialized nation would have an active program with educators in the prime of their career to do the educating, and not need to pull someone out of retirement because there wasn't a need for them to train their replacements until after they'd retired.
That's not what a "properly industrialized nation" is, and it's an impossibly high bar.
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.
