It's because people are commodities now. Human resources exists to manage the shuffle between warm bodies.
It's back to OP's point. There's no such thing as professions now. Just jobs. We put them on and off like hats. With that churn comes lack of institutional knowledge and a rule set handed down from the C Suite for front line employees completely detached from the front line work.
But even given that, how is it that everything doesn't work very well?
The normal functioning of markets would be that badly-working things are slowly driven out, while well-working things grow and replace them. Even without any reference to financial markets, this is simply what you expect to happen when people have a variety of things to choose from.
I could hypothesize that markets have evolved to the point where it's impossible for new things to grow unless they are already shit. Perhaps because everyone's too busy working for the shit things (which is partly because the government keeps printing money to the previously successful things in order to prevent the economy collapsing and therefore landlords got to charge exorbitant rent) or perhaps because they just don't have any money because of the above, and can only afford the cheap shit things (but a lot of the shit things are expensive?) or perhaps because people are afraid to start new things because they're afraid of the government (I've observed that not infrequently on HN, also something something testosterone microplastics) or perhaps because advertising effectiveness has reached the point where new things never become discoverable and stay crowded out as old things ramp up advertisement to compensate or perhaps we're just all depressed (because of the housing market probably).
Things might be shit in interesting and scary new ways, but there is no such thing as "the good ole days". Our mind wants to believe that things could go back to "how they used to be", "when it was better" but it's a fantasy.
It's an inability to face the cognitive dissonance and accept things as they are -- which is different than what we wanted! Boo hoo.
We all do this constantly everyday, some more than others :)
That said, humans are quite good at getting by even when things are shit. We've been doing it for untold eons.
Perhaps the only thing more impressive is how good we are at complaining about it all! Heh.
It's back to OP's point. There's no such thing as professions now. Just jobs. We put them on and off like hats. With that churn comes lack of institutional knowledge and a rule set handed down from the C Suite for front line employees completely detached from the front line work.
Enshitification run rampant.