Not to mention that in a substantial portion of the world, motorcycles aren't practical for most of the year. Snow, ice and cold aren't great for two-wheeled vehicles.
You should check out the Not Just Bikes Youtube channel.
The channel is mostly on city planning that supports walking and biking (rather than motorcycles) but the Dutch bicycle in the snow because they have an infrastructure that supports it.
But we ARE talking about motorcycles here. And sliding out on ice on a bicycle is wayyyy different than a motorcycle. Most people can muscle a bicycle into submission but a light motorcycle starts at 300lbs/130kg. Good luck holding that upright if you and the bike disagree on where the tires should be going.
I saw many comments above included stories from Taiwan. If you are not aware, Taiwan has an incredible amount of rain, yet there are scooters everywhere. I never understand how scooters remain so popular!
People wear rain clothes on scooters. This is very dangerous. Your vision is very bad in the rain and your control of the scooter is also bad. I did this when I got no other choices.
Yeah and if you need to tow a trailer they don't work either, but those are not very good arguments why we don't try to accommodate them in the situations where they do work very well, i.e. city driving in regions where it doesn't snow very much. The same applies to bicycles and ebikes.
Motorcycles can tow trailers. Sidecars are also a thing. In the 1950s there was a motorcycle dealership in Portland that had a motorcycle carrier sidecar. If your bike broke down they would ride out on their bike, roll yours onto the side car and give you both a lift back to the shop. No trucks needed.
Australia here. When we're not on fire or under water (which is also where scooters perform rather badly), it often seems to be too hot to wear safety gear.
Add the sense of entitlement of large 4WDs to complete non-enforcement of road rules protecting riders of both motor- and acoustic bikes by the Police, and you've got a deadly mix going.
Yeah, I think the Giant Car problem is what will doom this system in the US. True scooters like these can use the bike lanes in most cities (ymmv) so they might have a chance but they'll be stuck behind regular bikes and e-bikes and so limited to those speeds.
There is mesh synthetic safety gear that's quite good these days (I'd imagine it'll eventually disintegrate on a long slide, but will at least help with impact. Also road rash typically isn't what will actually kill you). It also comes in colors that will reflect the sun a little more than black, which is still the most popular motorcycle clothing color by sales.
I used to ride a lot in Ocotillo Wells where it would hit 110F in full safety gear, so it is possible. Helps when you're going fast enough to get wind chill.