The pattern shows up in the licence data before anyone says it out loud. Adoption reporting shows a spike at launch, a slide within a quarter, and a floor well below what the business case assumed. Nobody is being difficult; the training was generic where the work is specific. A course built on the vendor’s demo tenant does not teach a claims processor how to work a claim in your configuration, and the gap between those two things is exactly the gap the old spreadsheet fills.
Technical teams have a different version of the same problem. A new platform arrives, a cloud estate, an automation layer, an integration stack, and the team that has to run it learned on the project, from the consultants, informally. When those consultants leave, the knowledge leaves with them, and the operation runs on two people who cannot take leave at the same time. That is not a staffing problem; it is a knowledge-transfer step that was never scoped.
And delivery skills decay quietest of all. Project outcomes depend less on the methodology poster than on whether the people running work actually hold the habits, baselining, estimation, escalation, closure. Organisations that train those habits deliberately, against their own live projects rather than textbook cases, get delivery capability that survives staff turnover. Organisations that do not, re-learn the same lessons on each programme, at programme prices.