It's fine as a hypothetical ultra-niche product (although at this point fair to call it vaporware). But in reality people buy cars to be multipurpose tools (plus all kinds of other reasons of course). Inevitably we'll have the same conversation that comes up with e.g. the 80-mile range of the Leaf. "97% of people drive fewer than 60 miles per day on average" or whatever but the thing is that almost everyone occasionally drives way more than that in a day. If I do it more than like, twice a year, I'm not gonna want to go through all the annoyance of a zipcar or w/e every time, which means that outside of weird hermits and enthusiast ideologues the Leaf is only ever going to be a second car. That's fine for people who can afford to have multiple vehicles "for fun" but its negligible compared to the population of drivers.
Similarly, most people arent carrying around big boxes of stuff most of the time, but most people do it sometimes and that's why cars like the Smart and Scion iQ have never been more than a (stupid imo) niche. you can get a car that's much more capable and gets the same gas mileage AND costs way less in the form of the Lord's own Kia Rio certified pre-owned. Literally the only advantage a Smart has is that it can fit in a slightly smaller parking spot, which again is relevant to such a tiny number of people that its just a gimmick car.
The reason that the Eastern bloc built cars like the Trabbi and Moskvich are that they are adequate to do all of the things normal people are likely to do on an occasional basis: carry 4 or 5 people, lug around 700 pounds of whatever, go 300 miles, stay hot enough to not die in the winter, etc.
The only way to socialistically improve on the efficiency would be to have all kinds of vehicles in every community that people just use depending on their need for the day so you could have weird 1 person pod cars that get 90 miles per gallon and weigh 350 pounds plus like a big flatbed for when people move and idk, a bus. But if people are going to own vehicles that cost money to buy most of them are going to get 1 car that does all the stuff they need.
If knives cost ten thousand dollars everyone would have one big clumsy knife, not a little bitty one that can do an ok job 80% of the time.
