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.
Yeah it's got something to do with that & development being split between Dendrite and Synapse. I don't even really care to know since having to dig up the flaws with it then getting argued with by proponents who don't like to talk about them makes me annoyed. Many Rust developers have a whole cyberpunk ideology that results in their justifications being peppered with political stuff that sounds straight out of Arab Spring-stan anarchist twitter circa 2016. It's 2025 and those guys have successfully turned Syria into ISIS land. Yet they won't stop crying - but, I digress! I do not trust any nonprofit dependent on the world's largest concentrations of finance capital.
https://matrix.org/blog/2023/11/06/future-of-synapse-dendrite/