The thing Ive learned is that a lot of people have both a vested interest and a sort of stockholm syndrome with vendors (cloud or otherwise). If you spent tons of time learning AWSs special tooling, you are going to see everything as a nail if you catch my drift. Ive seen a few particular users here spend many threads defending their choices despite the often very logical criticisms levied against the "cloud everything" approach.
One thing I like to talk about to Cs is their strategy on capex vs opex, because honestly that determines quite a lot, but is often something engineers dont think about.