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.
Not really, you get 2 TSI credits included in the annually fee and I've only needed to use them once in 10 years for a really obscure problem I couldn't figure out. My experience with Apple support is that sometimes can be slow and frustrating but it works, unlike Google support.
Similar to Apple, I'd happily pay a yearly fee for better support with the Google developer program
Edit: I know at least 1Password and Bitwarden do that for you.