There’s a difference between “not supported” and “we are actively trying to break people who try it”.
The ASR utility was designed for Apple to use when imaging newly-manufactured computers. We are lucky that they decided to ship it with macOS so those who are able to use it as a part of a backup strategy can choose to do so. But we should never confuse the fact that the tool exists with Apple’s endorsing any particular usage beyond the one for which they designed it.
Ever since gas stations started accepting ApplePay, they’ve gotten far more secure. As with all other uses, ApplePay transactions are made using a device-specific account number and per-transaction metadata, so someone intercepting the packets never gets your card number and can only use the data to replay that single transaction (which will do nothing if the original transaction went through successfully).