Yes, agreed. I'd always buy something a wee bit bigger, secondhand. I've no idea how many Twizzys (what IS the plural?) have been sold.There have been attempts to produce very small personal cars before. The cyclecar era up to the early 1920's produced some innovative machines but the market was for the family car. After the war there were the French micro minis like the Rovin but were killed off by the Renault 4CV, a larger car for not much more money.
I remember in 1962 a Ballarat car dealer, O'Briens Motors, imported a shipment of the very small Subarus common in Japan. Well made, had favorable road tests, an ideal city car but they gathered dust in the Bakery Hill showroom until it was redeveloped.
It looks like a modern attempt at the personal car will be made with models like the Twizzy. Hidalgo would like a Paris populated with such vehicles but to be successful traffic streams of very heavy and very light vehicles need separation.