

Right until your PostgreSQL server goes down and you can’t call your IT department and have to start hunting for a contractor, find a budget, get it signed off by management and HR, then on-board the new staff member, that is, after you advertised the position, did job interviews, after first filtering through the 700 … or two, applications, each plausibly generated by a ChatGPT session. Give it something like six months in a big organisation, less in a nimble one.
Does an “entrenched” anything sound “nimble” to you?

Here’s three:
You’ll notice that I’m being deliberately vague.
All these share the exact scenario that the OP outlines. The organisations involved didn’t know that they were in deep trouble until well after the project instigator departed. No documentation, no updates, no training, handover, nothing beyond a set of credentials.