I don't know about the US but in Europe, charging is well specified. The typical standards are Type 2 for AC charging and CCS for DC charging and the European Teslas implement those. The Superchargers are fully CCS-compatible. This was demonstrated recently, when the authentication system on one Supercharger site failed and the Superchargers would happily charge cars of any brand at no cost. The news quickly spread and there were videos of a wide variety of cars charging at the Superchargers. Actually, they seemed to be more stable than some third party charging stations. Tesla did however fix that problem on the next day :p.

The SAE J1772 standard is good for 400kw, no?

I'm sorry I wasn't clear. There isn't a standard followed by everyone. I'm not saying it doesn't exist. I'm saying it's not being commonly followed everywhere.

ICE vehicles can run on diesel, compressed natural gas (CNG), liquified natural gas (LNG), liquified petroleum gas (LPG), and several grades of gasoline. A standard needn't be used by 100% of vehicles to be useful.

Also, in Europe Tesla uses standard connectors on their superchargers — other vehicles can be plugged in, but they won't charge.

+1, I actually think the push for "standardization" is premature. The most expensive parts are the transformers for meeting the cars voltage and amperage specs.

Having multiple cables is far from impossible and not a major cost difference. Most already do it with CCS and CHAdeMO, and its easy to foresee them slowly replacing CHAdeMO plugs with something newer and better() at some point.

() Yes, CCS is newer and better... but these stations already have those. They can't use two simultaneously, so having two CCS Cables with the same connector is usually (but not always) silly.

I cant resist....

https://xkcd.com/927/