I'm sad to see XMPP missing from this list. I wonder if the author was simply unaware of it or simply ignored it.
IMO XMPP is technically superior to Matrix. It "only" needs a cross-platform high-quality, branded app àla Element. There's underlying protocol support for all the features: video/audio calls, group calls, threads and reactions. Maybe missing are custom emoji (I think?) and channel grouping (which is still in the works). And of course all these protocol features work fine with federation.
IMO XMPP is technically superior to Matrix. It "only" needs a cross-platform high-quality, branded app àla Element. There's underlying protocol support for all the features: video/audio calls, group calls, threads and reactions. Maybe missing are custom emoji (I think?) and channel grouping (which is still in the works). And of course all these protocol features work fine with federation.