More generally: the world would be a better place if most people relied on password managers. If you can do it reliably, using any password manager, even the one built into your browser or OS, is better than not using one.
The problem is that it requires a certain amount of good hygiene when it comes to computer equipment. There are many people who are bad with computers, who don’t have phone backups and lose their phone, who will share accounts and devices, and so on. The result is an insecure mess.
So, solving the “people should use a password manager” problem requires solving all the other issues surrounding how non-technical people use and misuse computer equipment, so that having a password manager and not losing the essential data stored in it becomes the default.
For some people, it would probably be safer and easier to write down your passwords on paper, in a notebook. Other people will lose the notebook, or have it stolen from them. There are similar but more complicated issues with holding onto computer devices.
For people who are bad with computers, I think passkeys could work ok in scenario where somebody has just one device, they never upgrade it, never lose it, never break it, never accidentally click on "log out" in their passkey provider's account.
The problem is that it requires a certain amount of good hygiene when it comes to computer equipment. There are many people who are bad with computers, who don’t have phone backups and lose their phone, who will share accounts and devices, and so on. The result is an insecure mess.
So, solving the “people should use a password manager” problem requires solving all the other issues surrounding how non-technical people use and misuse computer equipment, so that having a password manager and not losing the essential data stored in it becomes the default.
For some people, it would probably be safer and easier to write down your passwords on paper, in a notebook. Other people will lose the notebook, or have it stolen from them. There are similar but more complicated issues with holding onto computer devices.