We're working on surfacing this information. It's hard keeping track of a diverse and evolving ecosystem - it's been attempted in the past (years ago), but manually keeping things up to date didn't work out because the info quickly got stale. More recently we've built tooling so that projects can document what they support in a machine-readable format on their site or in their repo. Most active XMPP projects are already on board with this, and we should see some nice front ends to it live soon.

The ultimate goal is an easy user-facing site with a shortlist of the clients that implement the expected modern features, alongside a longer filterable list for people who don't necessarily care about certain features (calls, for example, which are generally not expected in TUI apps).