They should teach how to use an abacus, too!
We also have a fair amount of tube-based equipment and infrastructure, for the same reason.
Even tube manufacture.
As a result of ready available parts, I took up building old school audio amplifiers as a hobby that turned into a small business where I sell serious amps to audiophiles for serious money — mainly because I love to build them — but they do, indeed, have much better sound over anything digital.
Admittedly giant, unwieldy, and persnickety, but I’ve ended up meeting people like George Harrison, Eric Clapton, and others, for whom I’ve built extremely high end systems.