I thought they had replied on this issue - that it's down to realism and they don't consider it an issue they want to fix.
If true, then I hope they reconsider, because I do not at all mind a bit of unrealistic, but beautiful color variation in a gaming universe I spend thousands of hours in.
Also just have a look at a barren planet like Pluto. It has spectacular colour variation: red, yellow, black and white.
Mars (in our time) has light and deep dark orange tints with blackish patches.
There should be enough natural realistic reasons to make at least some of the planets have a bit more character, be a bit more spectacular.
What I also would like to see is alien atmospheric planets with colours that indicate alien vegetation, or microbial life.
There could be seas with extraordinary colors because of alien plankton or algae.
There could be planes with red or purple grasses. Even planets with earthlike atmospheres do not all have to have exclusively green plant life for example. This might even be very unlikely.
Currently alien atmospheric planets have none of that kind of true alien weirdness.
Having said all that. I realize this might be planned for the future.
We have no idea of course what FD has in store in this respect.