This is a good thing.
I got the 100Amp High ower Wall Charger with mine, and this puppy needs some serious juice!
When i got the car, i used my old "Welder" outlet in the garage, which supposedly was rated for 30 Amps. Of course noone ever was drawing full load from this for long periods of time before people had EVs.
Even my 30A welder only pulls PEAK 30 amp, and not more than a few minutes at a time.
Once i plugged in the Tesla and charging at 30A, the plug got VERY hot, to the point where i was uncomfortable with it, and i manually throttled it back to 18A.
(My default the car will charge at 80% of the rated capacity, so a 30A outlet would charge at 26A)
I could imagine that if left unattended, and not watched over by a curious EE nerd, this would have ended badly.
For the 100A charger i ran 2Gauge wire (That's about as thick as your average garden hose!)
And even the 2Gauge get's noticeably warm at 80A sustained charging.
In the meantime i have been to many friends and family where i "plugged in" (or helped them install their own chargers) and I've seen some shoddy wiring in garages!
Most people use a Dryer outlet "rated" for 30A, but really only good for ~15.
And then for good measure they throw in a 40A wall plate connector.
The tesla charger only recognizes the plug, and - assumes if there is a 40A plug it can suck 40A out of it.
When that has been DIY installed on top of a 20A wiring..... bzzzz we have a problem!
So, hopefully the continuous line voltage monitoring will help a bit, and protect people from their own shitty wiring!