Yes, these will be stored in cloud storage like iCloud Keychain. But I can go into my iCloud Keychain and delete individual passkeys - or I may have only one Ap

Yes, these will be stored in cloud storage like iCloud Keychain. But I can go into my iCloud Keychain and delete individual passkeys - or I may have only one Apple device and then lose it. Or some malware clears out all of my iCloud Keychain.