I deeply regret having brought more than 3k users to Matrix.
This has just hindered us from adopting something better that works well. I also wanted to love Matrix and advertised it for a couple years, always thinking "Yeah, it's new, it will get better", but the issues have always stayed.
The people behind Matrix are nice and I wish them the best. Should the issue get solved in the future: I'll gladly try adopting it again. :)