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While they cant necessarily get "gear combos most used" from this, the can defo get most popular cassette / crankset combos. E-tube data protection notice
Edit: this is for e-tube professional, which I happen to have downloaded for some reason, not sure about the other version.
Im 100% confident that I stumbled upon a guy who was making his own custom PCB's to connect into di2, and was selling them at about $50 a pop. Cant find it for the life of me. But its out there.
@hippy Im sure Shimano is collecting data on gear combos most used...etc, and carefully evaluates this data to bring to market the exact opposite of what people want :)