I think the magic happens at different levels of abstraction as time goes by, and it's easy to get stuck.
Us kids could fiddle with autoexec and config to get DOOM going, today's kids can fiddle with a yaml and have a MMORPG that handles 10 000 users from all over the world going.
It's not the same but I can easily imagine it feeling at least equally magical for a kid today.
In many ways, things like RPi and Arduino have actually massively expanded the realm of totally hackable computing beyond what was even possible for early personal computer users.
I figure auto mechanics contended with this 25 years ago. Now it's hard to find someone to replace your water pump, if your vehicle even has one. Like auto mechanics, though, these machines still exist and there's still a big market for those skills. It might just require more legwork to find that work.
Old farts like us think the desktop is the default kind of computer, but it isn't. Most computers are phones, followed by tablets and laptops with touchscreens, and desktops are the weirdest ones.