We have a 1,600 sq ft 1952 ranch house that came with a 40 amp panel! Imagine the fun that caused. About ten years ago, we finally did some remodeling and upgraded to (I think) 300 amps. Maybe 400 for future-proofing.
The utility had to drop new conductors from the pole to the house, we needed a new mast, a new panel, all new breakers, as well as revamping a lot of the tired old wiring in the house and LOTS of new circuits to meet regs. We went from four circuits to 20.
And that's in Alabama, where heating an all-electric home in the winter isn't nearly as taxing as it would be up north (again while charging an EV if the Dims get their way in making everybody switch to EV's). And of course, that's while doing other things too (perhaps at that point in time not only was my home heater running and my EV was charging, but my wife and I may have also been cooking with our electric stove, perhaps my hybrid water heater was also running, and lights, etc.). The grid simply can't handle all of that if everybody was all-electric. Especially if they don't also go solar and produce most of the electricity they need (which I do, but about 20% of my power has to be pulled from the grid, so even I am an example of how the grid can't handle all of us going all-electric even if everybody lived in a good place for home solar like I do).