Why are there so many Guitar Hero fret boards?
Great question, and I’ve asked myself that many, many times. I don’t have an answer, only an educated guess. Different styles of guitars on different game systems developed at different times by different engineers.
Each engineer (mechanical and electrical) have their own personal ‘way to do things’. So different hole spacings, different hole diameters, different circuit designs, different number of wires.
Sometimes there are copyright or patents in the way, other times it is just stubborn pride “If you did it THAT way, then I’m gonna do it THIS way”.
There’s no way to know for sure, but I’m thinking there’s still more variations out there . . . just waiting.