If you have a private garage. I live in a (non-US) city where there's shared garages (those who do have a garage, a lot of them just park outside) which are old and not always have power sockets. And even if they do, I don't think you're entitled to use them to charge your car. And do EVs work with standard power sockets, or needs some special stuff? I've never driven an EV.
Most EVs seem to come with cables that work with regular power sockets, they're just more limited on output even compared to regular charging (not fast charging, which btw reduces battery life).
I don't know where outside the US you live but in some countries tenants have the right to install a charging station. Of course they're not exactly cheap, especially if the wiring isn't set up to handle that kind of load (from personal experience: charging your car while the washing machine is running on the same circuit in an old house is an easy way to trip the breaker).
Private charging stations can also be installed outdoors just fine and strangers stealing your power is not a problem either (the plug can't be removed if the car is locked and you can literally switch the charger off if you're not using it). Most public chargers don't have a roof so charging your car in the open isn't exactly odd.
Also in many countries even more rural areas now have charging stations. Often you can pay a flat fee per month to freely use charging stations on the same network or to do so at significantly reduced rates. In my case there's even a nearby charging station that charges approximately the same rate I pay for my home electricity provider - although the speed is also similar so it's not very useful if you don't plan to leave your car for a few hours.
The question in the survey is whether they "would cover
a hypothetical $400 emergency expense exclusively using cash or its equivalent".
Got $10k in highly liquid stocks and you'd sell some? Or you have plenty of money in your savings account but you use credit cards for all purchases? Then you get counted as "can't come up with $400".
It's useful to look at how the number changes over time, but trying to interpret the raw percentage is prone to misstep.
I don't have much want or need of an EV, but I was able to bring 240V power into my detached garage and install a 100A subpanel myself. It was all legal, I got a permit to do it from L&I and had it inspected and signed off on. Most states and local jurisdictions allow homeowners to do electrical work on their residences, assuming they go through the same permitting and inspection process as the pros.
I encourage anybody with the time and diligence to do their own residential electrical work. It can save you a lot of money, and add a lot of value to your home.
If you have a private garage. I live in a (non-US) city where there's shared garages (those who do have a garage, a lot of them just park outside) which are old and not always have power sockets. And even if they do, I don't think you're entitled to use them to charge your car. And do EVs work with standard power sockets, or needs some special stuff? I've never driven an EV.