I don't know that I have ever understood a reason to leave the native terminal included with any given OS, particularly after the Windows modernization pass in recent years on the terminal.
Same. Need multiple terminals visible at once? New window. Need a few separate sessions? New tab(s).
All the bells and whistles people have shown me over the years... it never even gets close to making me think "oh yea, that's better than basic tab/window management and the terminal app that comes with my OS".
layout, multiplexing, tab-complete, history, using the same interface across multiple systems, ligatures...
There are lots of distributions that ship emulators that don't have modern features, and even among those that do, I still don't want to learn the individual quirks every time I hit a shell.
Gnome terminal, yakuake, ptyxis, cosmic, konsole, xfce4-terminal, qterminal, etc all have slight variations between simple things like rendering and more important things like hotkeys. It's nice to have an alternative that I can install on any system such that I can get comfortable with just the one. If I can't install anything I'm often stuck poking around to find whatever the devs version of correct is, or else asking the owner of the machine "okay, how the hell do I do {x}?" if they're comfy with their cli, but chances are if I'm sitting there it's because they're not comfy with their cli.
I could cover a lot of it with a bashrc file, but I wouldn't want anyone fucking with mine, so I'm not touching anyone elses.
edit: distrObutions->distrIbutions
iTerm2 has builtin native tmux integration
Game changer
Splits. And tabs. But mostly splits. Nothing tmux and/or a decent window mangers wouldn't fix. But Macos.