http://lainyubrp2aabmxhepbttfdbl53dct2inqifs42buvpf6w44uiitbeqd.onion/blog/matrix.html
Adversary can do so much with information above! In fact, this is true for all similar protocols. Only SimpleX has moved ahead, but it is still problematic to use, to say the least. If you need a higher degree of privacy/anonymity - SimpleX is your choice, nobody haven't invented a better solution yet :) Let's visualize a scale.