Irssi's UX is better than that of any other chat software, though. Why it hasn't been replicated for things like XMPP and Matrix is probably due to the more difficult and featureful state transitions of those protocols.
I switched over from irssi to poezio a few years ago (with a self-hosted biboumi as XMPP<->IRC gateway) and I don't miss irssi (anymore).
Of course, the transition was a bit bumpy, but I think that'd go both ways. As someone else said, it's not a direct replica. Yet, it feels close enough and not too close for the uncanny valley.
There are several XMPP clients trying to replicate -more or less freely- the same experiences, such as poezio [1] or profanity [2]. YMMV of course, and nothing will be a carbon copy of irssi, except if you use a plugin (but in my experience bolting another protocol on top of a client for another will result in a poor UX).
I do believe there are TUI clients for Matrix, but I am unsure of their maturity and state, or how they compare to Irssi.
