I agree that tmux or screen is a must-have tool for servers.

But you certainly didn't read it all, or at least to the point where he goes more in depth of how crazy the working with Zellij is. After reading the parts of the interview with its author I'm not even going to check its webpage or trying it.

tmux for the worth. Boring, old technology = stable, well defined, well tested, without cognitive overload. Because life in IT is already hard enough.