For another, there aren't any good niches for, e.g., (pedal) scooters to move in cities so far. This hasn't been a problem, because the ~5 non-children per city using them so far (to use a number verified by a hard statistical method I call "pulling out of thin air") are easily worked around. Electrified "pedal" scooters OTOH are becoming more pervasive, and thus don't fit into the cracks of mobility, as it were. In addition, shared E-scooters are a plague simply by blocking bike and pedestrian routes because the companies externalize their storage to the public - and their users seem to be unable to not be assholes about it, on average. And the mode of transportation they replace isn't driving cars, but walking, public transport and perhaps short bike rides - all without any increase in carrying capacity for the riders. So they actually increase the environmental footprint of mobility, one of the major drivers of electrification, for all the drawbacks they offer...