The costs of upgrading your residential electrical system to the power levels needed to charge an EV at anything over Level 1 (even Level1 may not be possible for many residences) is simply staggering. Heck, even most light industrial service sections need to be upgraded to supply the necessary charging power.
And that's if you are the only one in the service area who is upgrading. There are very few residential power grids capable of large scale upgrade to even Level 1 chargers. To do so would require major transformer and transmission line upgrades - as well as major upgrades to existing power plant infrastructure.
So the bottom line on 100% plug in EVs is that we cant get the power to the consumer due to transmission line (much of which is underground) and transformer infrastructure and even if we did, we do not have power plant capacity to generate the necessary electricity to supply the grid demand.
I had to make no panel changes whatsoever, and that’s on a 22-year old house. Perhaps if you live in an old log cabin with screw-in glass fuses, you’ll have a problem, but any modern house should be able to handle it.
Your point about the overall capacity of the local grid in the case of mass adoption of EVs is valid, but I don’t get your point about Level 1 chargers. Do you live in an area of the USA where 110v, as used by Level 1, is unavailable? If so, what voltage do you have at the wall? Not sure what you’re trying to say.