10 Semis at once is not that big of a deal. The Tesla Supercharging stations at Harris Ranch in California have 98 250kW stalls total (plus some Charge America stalls at the same location), that’s easily enough to charge 10 Tesla Semis simultaneously.
“You really don't seem to grasp just how much electricity that is.” What kind of argument even is this, considering Tesla supplies this much electricity to their charging stations today?
It costs money, but Tesla is pretty good at building these things out affordably, sometimes including on-site buffering of the power using Megapack grid storage and on-site generation of solar.
About one-fifth the price of their competition in building out DC fast charging: https://electrek.co/2022/04/15/tesla-cost-deploy-supercharge...
(Although I suspect and hope their competition will catch up here.)