It definitely does, but I have not yet done any mountain riding that requires ascents of 500+ m, one after the other. Especially since low gear is quite low, I encounter few hills that I can’t climb. My biggest complaint is that low gear requires a very high cadence to achieve satisfactory speed and motor efficiency, and that is no fun on a long hill. A slightly smaller chainring would improve climbing ability even more, theoretically at the cost of top end speed (not really a concern), but it would compound the “insane cadence” problem. It’s also tough to come up off the seat and shift my weight forward while peddling so fast. My friends with more torque at their disposal always leave me behind on the uphills.