Passkeys are light years ahead of 2fA in user experience. Why do you dislike them?
Security based on devices is one of the positive innovations of smartphones and perhaps the only area where they've improved over the desktop experience.
I very specifically don't want my security tied to my device. Trying to migrate to new phones, and keeping things synced between a phone, desktop, and laptop is why I long ago moved to a password manager. Now, especially in the phone space, getting passkeys to function fully with a password manager ranges from "pain in the ass" to "not actually possible".
I had a botched phone battery replacement once resulting in the phone getting replaced very unexpectedly. It was a nightmare trying to get everything back together because I stupidly used google authenticator, which is tied to the specific phone it’s on. Not tying it to the device is the way to go.
I didn't consider the friction of integrating it into your existing process because I use a manual password manager. But who is saying you should replace a password manager with passkeys? It was always meant to be a parallel system.
Edit: I just wanted to add that people like you and I who have "solved" our credentials problems are a tiny minority. Passwords are shit. Just because we've grown accustomed to them doesn't change that.
You'll find that nobody has a problem with passkeys specifically. They have a problem with the implementation, and companies forcing passkeys onto users who don't want or need them.
I don't need passkeys because I use a password manager. My threat model requires that I can restore my password manager, all 2FA, and regain full access to all my accounts from anywhere in the world, even if a natural disaster occurs and all my devices are destroyed.
Passkeys and SMS 2FA are a direct threat to my threat model, and I can't help but feel they're designed to further entrench surveillance capitalism, and the invasion of privacy as a prerequisite for security.
Authenticator no longer works like that. You can now restore all of your 2fa codes by logging in to you google account and it's been that way for almost 2 years now.
Passkeys make plausible deniability more difficult. “This user name isn’t necessarily associated with my real world identity” permits some important good things.