You should really re-read the entire discussion. It wasn't about passkeys being able to be exported. It was specifically about clear text export.

> The fact that that possibility exists,

The possibility does not exist in the consumer synced passkey ecosystem. The post is from a year and a half ago.

A year and a half ago doesn't really matter; that this was ever even a concern from the industry, something that the industry could make happen at all, or even just was thinking about doing at some point in the past, poisons the entire effort. In a world where password+totp already exists and requires almost no hoops, no dependencies and is incredibly secure vs basic password flows, it's no wonder that folks remember discussions around curtailing user freedom around a new authentication pattern which already was less convenient, offers less user control, and further centralizes infrastructure in the hands of a few major brokers of technological power.

Until we have full E2E passkey implementations that are completely untethered from the major players, where you can do passkey auth with 3 raspberry pi's networked together and no broader internet connection, the security minded folks who have to adopt this stuff are going to remember when someone in the industry publicly said "if you don't use a YubiKey/iPhone/Android and connect to the internet, ~someone~ might ban you from using your authenticator of choice."