Hi all,
I just wanted to add onto this thread.
After further discussion with an Apple employee; while they cannot speak to future plans or timelines, the use cases for the Pseudo-random function extension (prf) in WebAuthn L3 are well-understood by their team and have "no philosophical objections to implementing."
Again, this is NOT a confirmation that Apple will indeed implement this extension into their OS', but I figured it is important information for those who have not already received the memo.