The podcast – Security Now No 972 – contains important information about Passkeys.
It is interesting to note that the host, Steve Gibson, does not use Passkeys. (At about One hour 57 minutes into the Podcast on YouTube – see following link).
This is the YouTube of the podcast – https://www.youtube.com/watch?v=fSNcUKphUtw&list=PLdPwyUeH0mS566Y0YZ7oAGghzMgRlWTBf
The part about Passkeys starts at about One hour 19 mins and continues until the end.
The latest William Brown Blog referred to can be found here https://fy.blackhats.net.au/blog/2024-04-26-passkeys-a-shattered-dream/
Although, it appears that you can store the Passkeys code on a Password Manager such as Bitwarden, there are other issues apart from the ones I was concerned about (see https://whysun.com/computers-and-the-internet/passkeys/ )
I am glad I decided to wait.