Synapse is the backend for Matrix and last I heard, people had been waiting a long time for an update, then it was announced the fixes were going to be on a premium version.
The larger issue is that Matrix (and Matterhorn and some others) development has been funded by NED technology initiatives, and is supported by big clients such as NATO and Reddit (or at least Reddit is using Matrix as a backend for their chats now). So they expect the public to keep their client system healthy while customizing software for the military intelligence arm of the imperialist countries. Meaning our interface will suck. Being reliant on these kinds of things is a long-term weakness.