But fair question. If tmux already fits your workflow, there may be no reason to switch. hrdx is more opinionated around running multiple coding agents across projects: it provides a workspace and pane sidebar, agent activity and completion status, built-in launch/resume flows, persistent sessions and layouts, and an external control API. The tradeoff is that it is much younger and less configurable than tmux.

Try it, play around with it, love it or hate it :-)