I think adding the ability to make multiple chat windows and tabs would be a good QoL update/feature.
Some people may like to send any private messages/dms from a server to another tab to make it easier to see, along with in-game chat notifications so the chat is not spammed or to just be organized in general.
Another Minecraft client has this ability but most people I know, including myself, have many issues using it and will randomly crash or there's unbearable lag but Lunar runs smooth like butter for us and we all loved this feature.
Picture: Each color on top is a different "tab" in the main chat window.