IGH person here, who didn't ride with derailleur and chain for 10+ years. One question I have here reading the discussion - why do we need more batteries and charging on ebike, which already have hudr battery installed and wired? This is such an omission in my opinion. Do Shimano or SRAM produce ebike-friendly eshift components? If yes, can they be retrofitted? Otherwise all these accessories are just annoyence for frequent rider. For me this is important factor - if component is critical for riding, it must be powered from main battery. Only optional things like dashcam mish have separate battery.