And this is important because our perception is more sensitive to luminance changes than color, and with our eyes being most sensitive to green, luminance is also. So, higher perceived spatial resolution by using more green [1]. This is also why JPG has lower resolution red and green channels, and why modern OLED usually use a pentile display, with only green being at full resolutio [2].

[1] https://en.wikipedia.org/wiki/Bayer_filter#Explanation

[2] https://en.wikipedia.org/wiki/PenTile_matrix_family