We're hoping to write a case study down the road that will give more detail. But the short version is that not all parts of the client's organisation have aligned skills/incentives. So sometimes code is deployed that makes, shall we say, 'atypical use' of the resources available.
In those cases, it is great to a) not get a shocking bill, and b) be able to somewhat support this atypical use until it can be remedied.
But, yeah, there's certainly a solution to provide better performances for cheaper, using other settings/services on AWS