You're exactly right - the Raspberry Pi does what you would expect a $25 computer to do, but that makes it inherently unusable for real world I/O expansion as a control system such as for automotive or home control. If Raspy users didn't have a BeagleBone, they could use the MotherBone™PiOne™ for a robust power system, I2C 16-bit GPIO slave, high powered USB hub and also utilize the five relays. Additionally, they can use the Raspberry Pi Pass Thru Header to use standard Raspberry Pi peripherals simultaneously. So without the BeagleBone Black present, there is still a lot of expanded capability using the MotherBone™PiOne™ for Raspberry Pi users. However if Raspberry Pi users do use the BeagleBone Black on board, it provides a highly intelligent Super I/O capability that unburdens the Raspberry Pi user interface and Operating System. Reading through the System Reference Manual, however dry and arduous it may be, will yield a lot of these "hidden" features of the MotherBone™PiOne™.