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One thing about CGA is that it was meant to be output via composite video instead of VGA-style RGBI. This video demonstrates the difference: https://youtu.be/niKblgZupOc?si=ASm2NFJx3I8Q9hTz

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Not "instead of", but "in addition to".

It also had other 4-color RGB modes other than magenta, cyan, white, and black, but that was the most commonly used one back in the day (even though it looked terrible IMO).

For example, here's a game (Kings Quest II) where they used the red, green, and brown palette with the background set to blue. A mode like that gave better options for color dithering since R G and B were all available, see here:

https://www.mobygames.com/game/123/kings-quest-ii-romancing-...

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