Sorry, I should have been more clear. I agree with you. I’m not talking about text-based interfaces and commands. I just mean the way Unix/POSIX handles “terminals” (devices that accept streams of characters according to a protocol established in the 70s) is an antiquated way of handling simple plain text streams. It made sense back then when there was a need to send commands to dumb terminals in-band with the plaintext but this doesn’t really make sense these days when your “terminal” is actually just a program pretending to be a dumb terminal running inside a window. When was the last time you used job control instead of opening another window?