The concept is good. A DIY alternative would be to build a foam+fiberglass shell around an e-trike for most of the same benefits.

Here in Germany you can buy slightly larger electric micro cars, with a speed limit of 45km/h and 60+km range for a 6000€ or so. There are even a good number of different manufacturers to choose from, althou they are all Chinese.

I prefer a bus over this. I can get on the bus in front of my house, leave it somewhere, go shopping/to work and enter the bus at the end of my shopping tour, while with this, I would still have to walk back to where my thingy is, carrying what I have bought and thingy would take space up while parking in the city, while the bus is constantly moving. If we talk about the 15 Minute City (which I already life in, with a bus every 5-10 Minutes) , something like this is overkill for most people and too small/not suited for professional delivery. Currently I pay 49 Euro/month for the bus and other public transport and this is 6.000 - 10.000 Euros.

That looks miserable in both summer heat and winter snow

One issue with these kinds of bicycles is that many designated bicycle lanes are obstructed by poles or similar to avoid mopeds and cars driving there in the first place.