[granos]

If the SDK in question is just a thin wrapper on REST then sure, it isn't providing very much value. But most of the SDKs I've used implement higher level logical operations -- things that require understanding the intent of the API/data model and how things are supposed to fit together. By being able to write my code against that higher level abstraction I'm able to save time and offload some of the responsibility for knowing how the pieces all fit together to the people who know that best. Ultimately my goal is not to make REST requests, it's to provide value to my customers, and the APIs I call are means to that end.