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I am looking forward to people getting outraged once again when Android does not allow third-party apps to handle 911. There'd be dozens of articles on HN about how Google is being anti-competitive and outrage will keep pouring in.

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HN might bean outrage machine some days, but like every Voip thing ever says you can't call emergency services with them. I always believed it to be a SLA deficiency in consumer internet? I'm guessing a strong preference for the real cell network to handle the calls would be necessary until this changes. Unless you can actually swap out the "phone" app on Android to have a 3rd party app make a real phone call?

Yes, any app can be a phone app ("dialer" in Android parlance), and there is a user preference to determine the default dialer app for sending and receiving calls.

In fact, Google has themselves made several available over the years; Hangouts and Google Voice are two examples.

There are definitely SIP trunks that allow 911 calling. Mine does, and they also allow you to pay for E911.

In fact Teams itself has E911 support, you have to enable it if you setup a phone number PBX.

What is missing is a way to say “emergency call failed” and pass it to another handler (perhaps even a low-level one built into the cellular part of the phone itself).

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