We really need to stop abandoning existing foss projects and thinking a whole new thing needs to be invented. Free and open-source software is not a product, it doesn't abide by the same rules and relationships that proprietary tech does.
It's more organic. It's also a commons that we can continue to draw on, and reshape. If I recall correctly, there were something like three different vector graphic editors from the same codebase before Inkscape managed to be the one that gained traction.
Matrix isn't perfect, but abandoning it just to reinvent it all over again just because some people really need a thing that works like Discord, even though Discord is absolute hot garbage; is just going to re-create all the same problems. Matrix today is better than it was two years ago. And Matrix in a year will be better from now.