I'm always put off by the incredibly low limits on yubikeys. What's the point of having a security key if you can only have 25 accounts in its lifetime? What are you supposed to do, buy tons of keys and then figure out a system to remember which key each account is? Like fucking hell just let me use passkeys in iCloud Keychain. My bank's mobile app specifically supports only security keys and explicitly not passkeys for literally no reason because passkeys are practically just as secure as any security key. It's actually harder to specifically exclude passkeys and allow only security keys than it is to just use passkeys which automatically include security keys.