Or even more critically, a discovery server that supports phone number registration so your existing contacts can find you again after they switch. The only ma

Or even more critically, a discovery server that supports phone number registration so your existing contacts can find you again after they switch. The only major discovery server on Matrix is currently the vector.im one, and it only supports email identity registration. As many people have pointed out, most users care far more about usability than they do security/privacy, so a service that allows an optional registration of identity using the currently-standard identity tracking system of phone numbers is pretty much a requirement.