I've been reading along here and will just chime in with the same old story I've repeated many times before FWIW
I started in printing around '74ish. The shop used "photo offset" printing rather than the movable typeset of Guttenberg or hot set type so it was fairly modern. In a large shop or newspaper there were many specialties, designer, typesetter, lay out, cameraman (large galley cameras made negatives of the layout) strippers/platemakers, pressmen, bindery...
There was a big (3 or 4 washing machines wide) computer in the typesetting room where you typed in copy and the machine (Compugraphic) miraculously composed it into justified columns (like a newspaper) and spit it out ready to paste up. It only did body copy, headlines you did by hand a letter at a time also using a different photographic process.
Looked sorta like this (although I don't remember the WSIWG display)

The whole photo-offset technology was really a boon to the industry. Starting after the turn of the century, it made for a great increase in quality and volume (think Time/Life/Look) over the older letterpress, engraved image process and grew like mad. I sorta liked the shop work but wanted to do design, but the way there was through the manual process of layout and I was too sloppy for that, so I went another way for the next dozen years. By then I could do layout in a single desktop, albeit a pretty expensive one, around '93ish. I was an early adopter, it was gravy.
Suffice to say, now all those middle skilled routine manual jobs on the front end are gone, replaced by me and my laptop. All the typeset, layout and prepress work once done by hand is done by the designer directly. At the shop the file goes into a machine that poops out a plate and onto the press it goes. Short run digital printing eliminates the plate and press, and of course the web & digital output eliminates all of it except me and my Mac. Obviously there are people who build cell towers and lay cables and operate servers who were not there before.
The design end of the job will continue as long as there are people who want to communicate something. But the doing part of the job, the manual translating of a design to a product, will continue to contract just as it has since I worked in that shop. Look at what you're looking at right now, someone(s) designed this page, some other one(s) coded the design into an app, but then however million "copies" served up since are done on the fly but a couple of flops of silicon switches in servers scattered here and there.
As always in the march of progress there are winners and losers. The muscle jobs are mostly long gone, humans replaced by horses by steam, FF, electricity. The really big shift that's happened over the last several recessions is that the routine jobs are going, line work, even the ones that take some thinking. Those are the middle skilled middle class jobs that are going and not coming back no matter how many tax breaks the corporations get.

The legitimate object of government, is to do for a community of people, whatever they need to have done, but can not do, at all, or can not, so well do, for themselves -- in their separate, and individual capacities.
-- Abraham Lincoln, Fragment on Government (July 1, 1854)