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"With current charging technology, that semi needs at least 2 hours to get 80% charge."

When you start out with an incorrect statement like that, it invalidates all your conclusions. The MCS connector (the Tesla uses on their Semi) is rated for 3,000 amps at 1,250 volts. That's a theoretical max of 3.75 Megawatts, and a practical limit around 3 megawatts. That puts about the same limits on semi charging as car charging, and some cars can get to 80% in under 20 minutes.