True, but not really relevant in this context. The fact is that graphical consoles could support all that because, in reality, there was a time they actually did - they were just independent embedded computers connected to the host via a serial port.
In my dreams, when switching to Tek mode, the framebuffer would have a dark green background, the lines would have a brighter green, and drawing would push the HDR for the brightest green it'd be able to do (because to store a vector in a Tektronix DVST, you flash it with a high energy beam). Erasing the screen would flash it light green and there would be no scrolling.
here are the VT100 ansi escape codes: https://espterm.github.io/docs/VT100%20escape%20codes.html
Bold, Underline, Double height, double width, etc... are all there. VT100, from 1978.
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