I do not know the in’s and out of ircv3. But we use matrix/elements for videocalls. Groupcalls. Screen and videosharing etc as well; Not just text chats. Beeing able to quickly search all of your chat history across all your channels and dm’s are very nice. Not requiering a irc bouncer to recieve messages is essential.
Atleast for us having another vm among the thousands we host in our dc is not a huge cost, but i understand that is not the same for everyone.
Terribly sorry. This is probably my norwegian shining thru. Where concatination of words are very common.