I use Signal, but it's fine at best, but it's not really going to break out of it's niche.
Why would anyone invest in a Google messaging system when Google is prone to kill it off randomly?
Google Duo has succeeded as an app known for making video calls, which is as much a marketing/positioning achievement as it is a technical one.
There are lots of people declaring they will use a Google product in this thread, but of course no one is going to use a nonexistent product that people imagine as a clone of what already exists. Unless Google finds an "in", they're not going to get anywhere, even with whatever perfect app HN imagines.
This is definitely where I'm at. I presume this is all about internal warring fiefdoms, because from the outside it makes no sense.
Desktop/mobile clients. No need for phone to login.
Oh, and server code written in Haskell :)
It's kind of like how Apple will combine security updates with stuff like new emojis: to increase the incentive for the general populus to update.
I sometimes compare Signal to iMessage, except it's cross-platform and private.