WhatsApp and most alternatives share the same problem
I wish that the author had spent more time really thinking about _why_ communication has moved away from email, or why XMPP&#x2F;IRC never really caught on despite being vastly older than these app competitors (hint: it is because they are federated, and so making sweeping changes to the protocol&#x2F;client in the name of UX becomes intractable.)<p>It is _very_ frustrating that the internet has had messenger fragmentation since the beginning of time, but why can Matrix solve this problem if XMPP cannot?  Signal just works.