How is it useful? I could never understand why I would want something like that as opposed to just using Tmux splits & terminal emulator windows. And this is th

How is it useful? I could never understand why I would want something like that as opposed to just using Tmux splits & terminal emulator windows. And this is the only selling point of iTerm! Everything else is strictly worse (lag, CPU/memory usage) compared to plenty of emulators.