Help! Stuck Schlumpf Shifter Button

I agree - but we can’t get ratios of 2:1 or higher with a single epicyclic hub such as a Schlumpf (or similar, like Harper’s or Frank Bonsch’s hubs). But indeed with such high gears we’ll see longer cranks just as on bikes. Biomechanically such setups would be better but the gearing might be more complicated and/or vulnerable, and they might have more internal friction too.

Apart from the biomechanical advantage of longer cranks, comparing various setups is where the Total Gear Ratio comes into its own.