CostmosRapidStart was created as a simple way to whip up a proof of concept project quickly, without having to spend a bunch of time thinking about the data layer.
Sometimes, you need to have a functioning POC, using persisted data. CosmosRapidStart is my way of getting a functional and interactive app for shareholders, partners, and teammembers quickly, an not having to spend a lot of time thinking about the data layer that is bound to change sever times. Being able to quickly alter entity classes and not worry about data layer implications early on has been a major time saver.