Tmux is pretty easy to pick up and build muscle memory by learning a few keyboard shortcuts from a basic youtube video and it's handy when you don't want to switch screens between multiple terminals just for one thing.

The ability to split and divide the screen pretty simply with a few keys is handy for anyone who spends enough time in a shell - the abilty to save that layout for the shell items you're using to load up easily again the next time is valuable too.

Multi agent orchestration likely just means keeping track of a few different windows all on one screen.