Though you make good points, perhaps Sharefile shouldn't claim that their API is RESTful when in fact it clearly isn't. There's nothing wrong with having a non-RESTful API, apart from it being far less clear and understandable as REST.
For many people, REST == ! SOAP. There is nothing more to it than that. And because REST is more an architectural framework than a protocol (remember, the protocol is HTTP), it's hard to teach them otherwise.
