Earlier quoted context omitted.
You have to be trolling Learning how linux operates, ops is done, networks are configured, firewalls are hardened, processes are monitored, resources are allocated, disks are backed up, ips are assigned, routing tables work, symlinks work, and code is deployed is never going to be an obsolete skill. Pick whatever amazing heroku, fly, render, replit, next, k8s, nomad, docker, whatever platform you think has abstracted…
I am not trolling. My view is that there will be a few very smart people at the companies you mention, doing those things. But most jobs in the tech industry will not require those skills. That's the point of specialization. It is efficient. You claim that linux, disk backup and routing tables will never be obsolete. Really?
If data exists, backing it up will never go away, and we still use magnetic tape drives for enterprise backup so no, disk backup isn’t going away, not within our lifetimes, and since your concern is the person wasting their time, I’ll assume our lifetimes is a fine timeline to look at.
Linux, and the open source world that exists because of it and GNU, aren’t becoming obsolete. With the steam deck and EVs, and android auto, Linux is deploying more places than ever, and only increasing. Every container you run is Linux, etc. Even windows supports running Linux.
Packet switching, which routing tables are a part of, is literally how the modern day internet is able to exist, IP protocol and all.
Everything you suggested are core to all modern day tech and won’t soon be obsolete, and you’re probably well aware. Perfect troll response with the selected tech you mentioned. Someone else will have to feed you.