Everybody organizes people, decide how work should be done, and has to make a lot of little decisions that nobody could anticipate. Not with the same leverage as developers, but with important consequences too. Somehow, management experts can't accept this.
We establish a difference between jobs where that training is relatively short (and thus we can expect it to happen on-site by the company who can hire people from other positions and have them do the new job) and the jobs where that training takes many years and thus requires significant pre-commitment and long-term planning to ensure that they can be filled.
For the purposes of crude statistics we pick an arbitrary line and label the jobs with <1 year of job-specific training required (starting from generic knowledge e.g. highschool or a degree in some other field) as "unskilled" and >1 year job-specific training required as "skilled"; but the key point is that there is a substantial qualitative difference between roles where you can "swap" people from one industry to another, and roles where that doesn't make sense at scale - while some individuals do switch high-investment careers, you're not going to solve a pandemic-prelate doctor shortage by re-purposing excess lawyers, but in that same pandemic you can solve a delivery driver shortage by re-purposing excess cashiers. Similarly in IT, the jobs which can be done by putting someone through an x-week boot camp do need different treatment from managers and policy-makers than the tech jobs which do require much more training and/or experience.
That's how it's done at all the US software companies I've worked at, including Microsoft and some startups.
My current company does has done away with job-titles entirely and we make up whatever we want on our business-cards (within reason).
But even a pretty low level developer is going to end up making important business decisions just incidentally as part of their job, because it's hard to specify out every little decision that could impact the business without basically doing the dev's job for them.
Businesses can embrace that or they can ignore it at their peril.