The reason is dead simple: the battery technology cripples electric motorcycles, so they're all sitting and waiting until batteries hold twice the charge in the same volume and weight, and cost half as much, because as Tesla has demonstrated, when you make things go twice as far as everyone else and twice as fast and charge in half the time, people buy your stuff.
Tesla is only cool because their cars are
incredible. Elon Musk, bless his outrageously out-of-touch billionaire's socks, is a nob of the highest order, but his cars rock. If Teslas managed 100 miles on a charge (hello Honda, derp, derp), they would be deeply uncool too. If they only crawled to 60 in 12 seconds, they'd be uncool. But they do 300 miles and smoke everything including bikes off the line. This is what electric bikes need to do. There are
no aspects at which EV bikes are better than ICE bikes right now (hoping for change) apart from performance, which is already beyond the capabilities of 99% of riders to use and 99% of roads to ride on and 99% of situations so that problem really is a solved one.
Cas