I think that is definitely the case with WH40K. They wag the dog, for sure.
Because of dynamic lighting and tricks that games can do, it gets tough to replicate a good looking monochromatic paint job. The BOS paint jobs are really pretty blah. Well, unless you wanted to do a Nuka Cola paint job, or Abraxo, or one of the other oddball paint jobs you can add to power armor in later games.
At any rate, I think your treatment was very genre agnostic, as intended.