Anyone who shows up and their only contribution is to push AWS services because that's what they know, the first question I asked them is if they are capable of doing it themselves on-prem. Their answer is no or they don't know how to or some babbling on about it's more expensive and ROI and things like that I dismiss them immediately. Because those may all be true things but without the ability to do it yourself it is impossible to make an accurate assessment if AWS or another cloud service is actually a good fit for what you're doing.