Its mainly because modern video cards only (heh, only) use 24bit colors. there are 256 shades of red green and blue. There just isn't enough colors to make a nice large gradient. Carmack advocated for 64bit color back in 2000 because of this.
There might be ways around it using shaders, which I believe are 32 or 64bit color, but I don't know enough to say.
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