You're confused. You can use software that doesn't provide backups or clear exports, but attestation is not supported for any widely used websites or WebAuthn software because it defeats synchronization, something pretty much everyone widely considers to be a benefit. It would for example completely negate the ability to synchronize passkeys over something like iCloud, whether or not it had the ability to export keys in a standardized format. Attestation is basically a boondoggle solely for corporations with device management policies, so they can use a standard protocol/framework at the app layer while still enforcing stuff they already enforce.

The amount of people in this thread who don't understand the very basics of this stuff is a pretty good counterexample to the common trope they somehow "know better." I kind of doubt that when many people here can't even get the basics straight.