The other down side is that when half of the households in the country have one plugged in most of the time and the predictable national electrical shortages ensue, everyone gets to pay the supply/demand curve.
As for “the grid” argument. The math shows we’d only need to increase the total energy output in the US by around 30% if almost everyone switched to EVs. That’s nothing.
Any one capable of thought could figure that out. During hot or cold weather the electric grid is taxed. Last winter in Texas and every really hot day in California for example. New home building fees aren't enough for all the loads they put on every where they are build.