Being able to use native macOS shortcuts like Command-` to move between windows. Native copy–paste. Focus-follow-mouse behavior for panes. Or just the ability to see multiple tmux windows (not panes) at once. And perhaps most importantly, the tmux windows actually look any any other window on macOS.

Huh, all those are features of tmux itself. I can copy/paste to/from system clipboard, I can easily movie between windows (and could set in my tmux.conf to use Command-` if I wanted), I can focus panes with the mouse, etc.

> Native copy–paste

This was a big one for me. Cut/Paste between applications and whatever is running in the terminal with tmux can be a real pain. Not so much with iTerm. And the consistency goes a long ways when you're trying to get stuff done.

The major advantage is performance. With tmux, high volume output from a single pane makes the whole session unresponsive, because it locks up the pty that tmux is running on. Native panes, on the other hand, don't have such a problem because it operates on different ptys.

Being able to copy and paste using the OS native cursor over multiple lines, for one.

That's possible in tmux, though

Is it possible to copy and scroll over multiple pages using mouse in tmux?

not on remote sessions with local clipboard

Clipper makes that possible (shameless plug).

https://github.com/wincent/clipper

How much stuff does one need to keep adding just to make it work like iTerm does already?