I’ve been trying to keep an up-to-date list of questions and answers about sovereign worlds. This question is on the list.
Which is why I made this post showing the biomes categorized by tier. Hopefully though we can use higher tier biomes on lower tier profile worlds. I think the reverse would be too cheaty since higher tier worlds are supposed to be difficult to traverse and whatnot but I think self-imposed difficulty shouldn’t be a problem if it’s what people want to build with.