Window management. It's basically a way to segregate a general terminal (usually used for local stuff) from a window specifically for SSH.

For me this was a much bigger issue when I was on Windows, but also in Ubuntu which groups programs together similarly to the Windows taskbar. I'm on i3 now mostly and just use a normal terminal for ssh, but for quite some time I was using putty on linux specifically for window management.

Sounds like a use case for tmux?

No, not really. I'm talking about OS-level window management. Being able to open a specific window with a single chord.

It is what I use on Windows, so I'm familiar with it, and it supports serial comms.