My concern is congestion as more vehicles try to charge, and the slow charging speeds of some of the non-Teslas. Having to wait while a non-Tesla is slowly charging seems quite insane. I think Chevy Bolts and Nissan Leafs max charge at 50kW. Would be annoying to wait while a bunch of those tried to charge! Defeats the purpose of having supercharging when the vehicles clogging the network can't supercharge.
Not to mention, lots of drivers don't realize you don't charge to 100% full, but rather to full enough. I hope Tesla at least does some Ramsey pricing, ie, uses multiple charging rates for Teslas and non-Teslas. You don't want to create a financial incentive for non-Teslas to ignore Chargepoints and EVGO and EVAmerica, etc., because it's cheaper. You still want those 3rd-party charging networks to be a non-Tesla's priority. You want Tesla's network to be last choice, for non-Teslas, but to create opportunity to reach destinations that might have been unreachable given the lack of 3rd-party charging infrastructure. You could even do increasing charge rates to make it clear a vehicle shouldn't charge to 100% full, so, for example, after hitting 80% SOC, increasing the kWh charge by 50% or something along those lines to make it clear that charging to full is not optimal.