Isn't it obvious? Let's explore the details.
Google Messages already has a location-sharing feature, but it's more for dropping a static pin on a map. That's fine if you're staying in the same spot, but not much use if you're on the go. The difference here is that the new option updates your location as you move, making it much easier to connect with someone.
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At this point, you may be asking why PRF is part of WebAuthn in the first place.