This an example of survivor bias dressed up as general advice that doesn't consider the entire ecosystem. And we need look no further than what's happened in Hollywood with writing in particular.
The general progression of a Hollywood writing career is from PA (production assistant), which often starts off as a volunteer "intern" position, to writer's assistant. Assistant here usually means doing any meanial task anyone wants from fetching drycleaning to taking a dog for a grooming appointment. When you're a writer's assistant, you will oten spend time in a writer's room. You will see how the process works. You probably won't contribute anything but you may get feedback on tehings you've written from whomever you're working for.
The next step is as a staff writer. You will be paid to produce scripts and stories for a TV show, for example. That writer's room will have a head writer. On a TV show the head writer is almost always the showrunner. The showrunner is effectively the leader of the entire project and is responsible for breaking up a season intoo storylines and making sure those scripts make sense as a collective. They might one or more of those scripts or maybe not. The showrunner will hire directors for each episode.
The path from staff writer to showrunner often goes through being a producer. Producers are responsible for a lot of the logistics of filming a show. Hiring extras, finding locations, coordinating stunts and costumes and making sure the director has everything they need.
As part of all this, in the 22 episode TV era, writers would often end up spending time on set while the show is being filmed. They'd learn from the process.
Every part of this was necessary. Those writers on set are your future producers and showrunners.
So what's happened in the streaming era is that writer's rooms got smaller (so-called "mini writer's rooms"), maybe only the showrunner is ever on set, the writers have stopped working by the time filming even begins and you might only be doing 8-12 episodes. On a 22 eipside season, that one job could support you. 8-12 episodes can't.
But you see how this all breaks down when writers can no longer support themselves, they're no longer being trained to be future producers and showrunners, there's no feedback from set back to the writer's room and you end up with 3 year gaps between seasons. The only reason for all of this is because it's cheaper.
So, you may be a staff engineer who tech leads dozens of other engineers. You're not formally a manager or director but you have a lot of influence about the entire project. But how did you get there? You started as a junior engineer being told what to do. You got to see how other leaders operated. You became responsible for more and more things. You might start fixing bugs under supervision to managing a feature then an entire project and so on.
So what's going to happen here is (IMHO) we will have years of the software engineer space shrinking. There'll be very little entry-level hiring. Layoffs will reduce the entire workforce and there'll be a few tech leaders who hang on because they still produce value. Some of them will probably discover they don't produce enough value and they'll go too.
But where do the future tech leaders come from in this scenario? AI is being used as an excuse to kill the entry-level pipeline and if you go around and say "git gud" [sic] then I'm sorry but you just don't understand the impact of what's happening or you don't care because, at least for now, you're simply not affected.
You see the same thing with people who espouse the myth of meritocracy. Well, if a given workforce shrinks by 50%, half those people are, by definition, not going to survive. An individual may be about to reskill or skill up to survive but not everyone can. And that's how people end up in Amazon warehouses. At least until they're no longer needed there ether.