You told me some things that you can do in the Terminal Tab, nothing about what you can't do. Many people are going to think "oh, a terminal, I can ssh into my computer at home and retrieve some files." I don't believe you can do that with the Terminal Tab. Perhaps calling it a "Terminal" is too general. I'm just asking all these questions because there isn't any docs that I could find on it.
So a description of the Terminal Tab might be:
The Terminal Tab is where you get messages and feedback from the hardware you are connected to. It will echo the gcode being sent to the device. Some commands can be sent specific to the hardware. It doesn't have any connection outside of the specific hardware OctoPrint is currently connected to.
Is that concise enough? Would you make any changes to that description?
Thanks for you help.