It's a shame to see you get downvoted (presumably because you don't cite any evidence for your assertions). As a counter-point, I will give the oft-quoted-by-me 1990s promotional video of the use of IBM CallPath on an AS/400 which should get you all misty-eyed https://youtu.be/5pY6Xxptp9A?t=2058
IBM it's a special case. You often have the exact tools under the terminal interface and the GUI 1:1. You can do the same task in the CLI, TUI or with a GUI, now it can perfectly be over a web. But for minimum latency the CLI and TUI are essential and even a 9front user as me I acknowedge that. But 9front it's a special case too; it was basically made to be modular from day one and you can just set a CPU server and connect anything into it over 9p, be physical or not. No SSH needed, everything works the same everywhere.
Since this is really just a legacy system operator monk / retrocool interface, they spend years debating ancient DEC theology.