I can’t quite tell from that screenshot: is there an IRC client that supports newlines and where you have some indication of whether the other clients support newlines?
The inability to structure text visually is my biggest reason for avoiding IRC.
Ofc you can use IRCCloud Teams, create servers with one click, but also pay for that.
And what other modern features ate you looking for? This is IRC today: https://quasseldroid.info/assets/images/phone.png and emoji reactions, typing notifiers as well as threads are already supported in some clients and being standardized.