I think inertia allowed things to go sideways for a long time in a lot of professions, without paying the price for it soon enough. It stayed unseen for long because those jobs are often not affecting directly the structure main goals, like sales, manufacturing or field agents. They are support jobs, and help the structure maintain its integrity on the long run.
So it takes time for the problem to be detected, and for the top to even become motivated to fix it. It's quite possible they didn't even know it was a problem, or didn't think it was important. Hell, the person currently in charge have likely arrive at the post way after the decisions to destroy those jobs has been taken, years after years. Each year, one small increment at a time.
We are seeing an extreme version phenomenon in the health system in France. Extreme because it touches more than support jobs. Hospitals are full of exhausted staff that are asked to make yet another effort, "just this once". Getting appointments for specialists now take months, even for repeated sessions. Doctors are making much less money than I do in IT, for much more work, responsibility and administrative pressure. This frog has been boiling for quite some time.