Context for why we're removing the implementation: - https://github.com/matrix-org/matrix-spec-proposals/pull/2716#issuecomment-1487441010 - https://github.com/matrix-org/matrix-spec-proposals/pull/2716#issuecomment-1504262734 Anyone wanting to continue MSC2716, should also address these leftover tasks: https://github.com/matrix-org/synapse/issues/10737 Closes https://github.com/matrix-org/synapse/issues/10737 in the fact that it is not longer necessary to track those things.