Third party lenses that cannot be updated by the camera body will include a USB port.

Why would this be a good idea to break away from the norm of what has been done before? The mechanism of updating the lens through the camera exists. Why reinvent the wheel? It only increases the BOM for the lens to include the USB and the electronics involved.

	▲	CobaltFire an hour ago \| parent [-]
		Because third party lenses cannot leverage the camera body to update. Sigma has a dock that allows updates to their lenses in this fashion however.