While standardisation is 'nice' - particularly essential for interoperability at a technical level for equipment from different manufacturers to communicate - limiting the type of connectors used (which is often a 'standard') is likely to stifle innovation. Imagine if, years ago, the standard defined the 3.5mm jack plug as the standard - you wouldn't be able to have an iPhone, cos the plug assembly could never be made small enough to fit in the phone form factor. Standards can have wide tolerances, e.g.: my radio mics have attenuator switches in the transmitter and receiver. I have to set them for one set of values when connected to the camera, but another set of values when connected to my laptop. But that's still a standard. One socket type is too restrictive.