ncurses gives you all of that in a much easier-to-use fashion.

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.