Well, SAP has for long been a money making blackbox for consulting firms. Think IBM, Accenture and the likes. They rake boatloads of money for multi-year contracts to implement SAP systems for companies wanting ERP solutions. The system is outdated and obscure with both technical and non-technical people having a tough time understanding it. Last time I worked with some interfacing systems to some SAP modules, it still relied on web services, XML and SOAP. No REST support. Salesforce is on the same road. In a few years, they will spin up more modules apart from CRM, like manufacturing and payroll.