Matrix today is more accessible than XMPP today. Matrix today has more communities than XMPP today. It's a pity that XMPP's hopes were dashed by the EEE of Google and Facebook, but I think if we want to make people move towards a decentralised protocol, we need to pick one, and I don't see a reason to spend my energy on reversing the direction of XMPP when Matrix is heading in the right direction.