Ooooh, you're wanting to limit this to fast charging only? Then we're going to have to go into the weeds on this analogy about what current levels are supported in the official USB 2.0 specifications that most power blocks are built to. (I'll give you a hint: it's not fast charging.)
Uh. no.
I'm wanting to limit it to why your analogy sucks.
Let me try and make is simpler.
Phones:
Person A has an iphone with a lightning connector
Person B has an old iphone with a 30 pin connector
Person C has an old android with a miniUSB
Person D has a new android with USB-C
all of them came with a wall charger from the manufacturer that provides a USB port as it's output port.
all of them can plug
all of those phones into any other of the 4 persons phone charger with a simple adapter.
Charging speeds (as I mentioned already) will vary- but all will charge and work fine. Slow chargers will work fine on
all the phones with an adapter. Fast chargers will work fine on
all the phones with an adapter (though again not all might benefit from the higher speed)
Still with me?
Now- EVs in the US.
Person A has a Tesla Model 3 with a Tesla connector (the subject of this forum topic)
Person B has some other brand of EV with a ChaDemo connector.
Person C has some other brand of EV with a CCS connector.
All of them have some public chargers that use a proprietary output port (Tesla, ChaDemo, or CCS)... right?
Now- here's why your analogy
does not work
Because, you see, unlike the phones,
all these people can not all use the same charger via an adapter
Person A can't use ChaDemo or CCS. At all.
Persons B and C can't use Tesla. At all.
Hope this clears up why your analogy doesn't work.
The majority of those USB wall warts only supply 0.8 amps or 1.0 amps, because that is all that the USB 2.0 spec actually allows
Uh....what?
USB - Wikipedia
USB2.0 Spec said:
Battery Charging Specification 1.2:[23] with increased current of 1.5 A on charging ports for unconfigured devices, allowing High Speed communication while having a current up to 1.5 A and allowing a maximum current of 5 A
But that doesn't change the reasons your analogy doesn't work.
The lack of adapters to be able to use any car with any charger, while you CAN use any phone with any charger, is why your analogy does not work.
If you want fast charge with a phone, frequently someone's USB power block on the wall won't support that
Why not?
I fast charge my iphone on friends android USB chargers all the time with the right cable.
But again that doesn't change the reasons your analogy doesn't work.
The lack of adapters to be able to use any car with any charger, while you CAN use any phone with any charger, is why your analogy does not work.
, (and even a lot of USB cables don't have thick enough wire gauge to support that)
Unless you're running like 10 foot plus cables or something this is an imaginary issue (and even then it's an imaginary one unless you're using ancient, cheap, cables you got with a free phone years ago or something)
But again that doesn't change the reasons your analogy doesn't work.
The lack of adapters to be able to use any car with any charger, while you CAN use any phone with any charger, is why your analogy does not work.