From what Ross said here I agree that higher tier biomes on lower tier planets should not be an issue.
But Xaldafax is right that you also don’t want low tier biomes on high tier worlds or to be able to have too much control over which biomes you use for more lucrative worlds or it makes resources easier to get. Ross said biomes don’t have full control over spawning of resources but there is some control so total biome selection could be used to exploit things.