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With anything like this coming from Apple, especially security and cloud features, I always wait a long while before using it. Apple tends to mess things up a lot, and the users pay dearly for their mistakes. So things like iCloud Drive, iCloud Photos, 2FA, I had always waited a long time before activating. I haven't turned on e2e yet for the same reason. It will be at least a year or two before I consider using passkeys with Apple.
You'll likely start using passkeys after upgrade without even realizing it. They do not eliminate your AppleID password, they augment it.
 
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