Having ridden an auto nuvinci/enviolo I can confirm it’s fucking awful and seemed to do the exact opposite of what you wanted - pedal harder to speed up and it lowered the gear, its purely based on cadence though , you set the cadence you want to pedal at and it changes automatically to keep you at that cadence. Probably perfect for a plodder on an ebike that doesn’t understand gears.
Having ridden an auto nuvinci/enviolo I can confirm it’s fucking awful and seemed to do the exact opposite of what you wanted - pedal harder to speed up and it lowered the gear, its purely based on cadence though , you set the cadence you want to pedal at and it changes automatically to keep you at that cadence. Probably perfect for a plodder on an ebike that doesn’t understand gears.