Moreover, the Matrix spec process requires that you have proven that a proposal actually works in the wild before it’s merged into the spec. This is a feature,

Moreover, the Matrix spec process requires that you have proven that a proposal actually works in the wild before it’s merged into the spec. This is a feature, not a bug. Just like browser vendors demonstrate a feature behind a prefix before it makes it into HTML, so do we with Matrix… to avoid a situation where the spec contains vaporware or spec for the sake of spec.