True if you are being specifically targeted, but there are whole classes of vulnerability that you are better off not having even if you have less than perfect opsec. To take an extreme example, my personal server may have an unpatched vulnerability that a determined attacker might exploit, but that doesn't imply I might as well share the same password across all my accounts.
Irrelevant to the argument I made. My argument already assumes you're using unique passwords, since it's made quite simple these days.
Good passwords (stored on the backend with a password-optimized hash) are pretty close to bulletproof, and all browsers that I've used in the last few years prompt you with very good passwords.
Again, the key is that people who would use passkeys are the same ones who will be using good, non-reused passwords in the first case. We've taught non-technical users too well that they should not pay attention to out-of-browser prompts, so they're not going to be able to use passkeys without significant and broad re-training.