To count a move from 20 to 16% failure rate for charging attempts as a sign of real improvement in the American charging experience just shows how, once again, the US nowadays tends to deliver shittier experiences than other developing markets.
It's a big improvement (20%), it's just that it has improved from abysmal to unacceptable. I think the original sin of EV fast charging is that just because you can put a fast charger anywhere you have sufficient electric supply, doesn't mean you should.
An EV charging station should have an awning over the chargers to protect users from the elements. Machines should take plain old credit cards and not require an elaborate song and dance with an app. There should be an attendant present to help disabled people with refueling and discourage vandalism of the machines. The attendant could also take cash and manually enable machines for customers without credit cards or when the network is down. You know, all the things a petrol station has.
Cramming 4 EA machines in the far corner of a Walmart parking lot behind the dumpsters, 2 of which have had their cables stolen for copper and one of which is broken does not a great experience make.