That's sort of my point. I'm also an old fogey in Linux hipster-land, who started off with RH5, then moved to Mandrake, then Gentoo somewhere around the kernel 2.2->2.4 transition.
It was really important then to know how to identify hardware so you could actually have it supported in your kernel (I don't remember if `genkernel` didn't exist yet or whether I was just trying to squeeze out as much performance as I could -- probably the latter). But it was also the era of winmodems, winprinters, risk of actual damage to your monitor if you screwed up the modes in X11R5/6.conf, we had to use `lilo` and remember to update it every time, etc, etc.
A lot of the people I talk to know who end up in the same positions as me still use those skills -- but we use them at distro vendors to make sure that 'normal' users never need to worry about it. Honestly, with the way Linux has been adopted, my expectation would be that by the time I exit the industry, people with the skillsets you and I have will be rare, and mostly unnecessary. Linux "just works" on the vast majority of hardware these days, and we old fogeys put a lot of blood, sweat, and tears into making that so.
It's not that I think that it's useless, it's that it's not _required_ knowledge anymore, and anyone who is convincing themselves that it's giving them deeper knowledge considering the vast increase in complexity is kidding themselves. In a pre-EFI world where all you needed was a binary (any binary) located at `/init` which "knew" how to handle everything else, it was great.
At this point, if I were starting from scratch, I'd tell people try to really understand how EFI works (https://www.happyassassin.net/posts/2014/01/25/uefi-boot-how...), get a handle on IOMMU groups+SRIOV/nvme namespacing/whatever, and learn as much as possible about network namespacing and how SDN/CNI work, so "how does a packet get from the outside all the way to a pod || EC2/openstack instance || whatever" is reasonable, and that's not even touching "how does `dracut`/`mkinitcpio` come up and hand off to systemd+cgroups", because those are the areas where things are likely to blow up, rather than "whoops, you forgot to build the driver for your HBA into your kernel and now you can't boot", or "X11R6 completely shit the bed after a driver update broke your Xinerama config".
Different years, different problems, different things are important. What was crucial for us to learn in 2000 hardly matters in 2022 when an Arch live USB will more or less boot on any system anywhere and get you a working framebuffer, with a couple of commands to bring up your system.