Have you ever used something like Wardley Mapping to do the analysis?
Most on-prem solutions I've seen aren't sustainable, massive Capex costs, teams of people that could be better used in other ways just to keep trivial things applications running
No shit, taking advice from a car salesman on how often to buy cars and what cars to buy is about the dumbest thing you can do.
His entire livelihood and career was built on selling this story that you need to pay others to run all of your infrastructure for you. He’s shilling IT illiteracy rather than pushing for more sustainable on-prem solutions.