To me the problem with high speed is primarily safety for pedestrians and other bikes. Given also that the state has just given the city the green light to redu

To me the problem with high speed is primarily safety for pedestrians and other bikes. Given also that the state has just given the city the green light to reduce the speed limit on most streets to 20MPH, the delivery guys will stand out even further. If you run out of juice, you just get another bike (and attach whatever you use to carry the deliveries). Battery safety and longevity should be better when charging and monitoring across an entire fleet, using e.g. slower speeds as you mention. This, of course, would require getting more stations and bikes into the network, which would be a win also for regular users in outer areas who are sorely underserved right now.