EMP damages semi-conductors.

We Electrical Engineers have been using semi-conductors as the building blocks of our trade for many decades now.

The younger engineers use software to represent their semi-conductors as they do their designs.

Soldering skill isn't as widespread as it used to be and hand-soldering is likely to be regarded as a niche skill at best.

Even ham radio operators can't be relied upon to know anything about wiring or soldering anymore.

Going back to the technology of vibrator (relay-based) voltage regulators and such would be difficult as the fundamentals of that technology aren't really in the toolbox anymore.

Consider a technology reset to be akin to going back to the days of flint-knapping to build edged tools. It's still out there but it's not common.