* We are not rolling our own. Whether we host it ourselves or pay for a service, we’re getting something off the shelf that best meets our needs.

* We are evaluating products, not protocols.

* We aren’t picking an outlier; whatever stack we choose needs to be a modern, proven service that seems to have a solid provenance and a good life ahead of it. We’re not moving from one idiosyncratic outlier stack to another idiosyncratic outlier stack.

Given other language such as "modern expectations" in regard to interfaces and being "spoiled for good options" as well as Rust's move to Discord possibly setting a precedent within Mozilla, the posters in the HN thread above don't have a lot of hope Matrix will be selected even via Riot.