Not willing to be the party pooper, but isn't htmx's appeal the simplicity of it?
I would expect it to be "done", or maybe could be refined with a couple more little things, but definitely not needing full-time dedication on making a version 2.0 or adding new features.
I guess this is Apple's way to add Passkeys support into Chrome as well, for macOS users using Chrome, which is very common, or macOS users with an Android device.
Edit: I know at least 1Password and Bitwarden do that for you.