The problem with that is, there's only one thing, some product manager somewhere, that sits on a light switch of your company or project's success or failure. They could even unintentionally end you with a price change.
For instance, putting your EC2 instances in a VPC has been the preferred way of operating since 2009. But, if you have an account old enough, you can still create an EC2 instance outside of a VPC.
You can still use the same SQS API from 2006 as far as I know.