A motorcycle on its own is a perfectly balanced machine. It takes a fairly large assemblage of human errors to wrestle one to the ground. It only happens more often with bikes than cars because bikes give you the freedom to write as big a check as you think you can cash.
There's an expansive gap in knowledge between one's M1 certificate and real-road proficiency. Few ever take it seriously, and would rather "send it" over the gap the hard way, but with the internet, the steep and often-painful learning curve is entirely optional. A couple cones, a parking lot, and a few drills from the right tutors on youTube can help unlock your machine's braking, accelerating and cornering capabilities, all while riding relatively slowly in a protected environment. Once you know what 100% of your ability is, being ready for the street simply takes having the common sense to leave half of it in reserve for bad weather and the dumbest thing someone else can do at any given moment--And knowing how to intuit all the potential stupidity around you.
The problem with these sorts of motorcycle-like cars is that you still need a regular car. You may not need cargo space or passenger seats all the time, but you do need them some of the time. Plus a motorcycle can fit in a parking space with another car. This thing can't. It's just a second car, but small. You also can't lane-split with this, or park it wherever you want. You'll look like a genius that one time you find parallel parking too small for a normal car, big enough for you, but you could've had your pick of any space between any vehicles with a motorbike. And you're just as relegated to traffic jams as you would be in a much bigger, more comfortable vehicle.
Okay, sure, on a motorcycle you can get yourself into trouble, but only because you're free to do whatever you want. You can split lanes at a hundred miles an hour, or pull wheelies through intersections. Or fly around that corner and gas it hard on greasy painted crosswalk lines. There's rarely ever traffic physically blocking your bike, or lights blinking on your dashboard electronically rescinding your input to "absolutely send it" like you would find while driving your car, but if you didn't have those limitations while driving, don't you think you would figure out how not to crash?
Just putting this out there: you can find an older Honda CB750 or whatever for a few grand--much cheaper than a smart car or something similar. Not enough power to get you into trouble, just enough power to get you out of it. Good looks for days, doesn't take up too much space in the garage and you'll never walk by it and regret owning it. Or if you'd rather not deal with the accompanying protective outfit, there's lots of mopeds and ebikes that may fit the bill too.