There is no way this adds 300K to the price of a house, and it does not take 75 minutes to charge a Tesla, more like 15-30 minutes at a supercharger depending on your state of charge. Stop the FUD.
Tesla logo at Supercharger station
Tesla supercharging stations charge with up to 150 kW of power distributed between two cars with a maximum of 150[13][14] kW per car, depending on version.[15][6][16] They take about 20 minutes to charge to 50%, 40 minutes to charge to 80%, and 75 minutes to 100% on the original 85 kWh Model S. The charging stations provide high-power direct-current (DC) charging power directly to the battery, bypassing the internal charging power supply.[1] The next version of Supercharging was expected to charge with more than 350 kW.[17][18]
