I mean, Tatooine was just a desert, Hoth was just snow, and Endor was just California. Outside of Cloud City, “alien” or fantastical looking planet designs were really just a prequel thing. I’m not saying this is good or bad, just that it isn’t unique to the sequels.
This was something I actually thought was really cool about TRoS, showing that Mustafar isn’t all volcanoes and lava. Kef Bir should have been Endor, too. I wonder how a fanedit might make that more clear.
An alternate ending to Episode 9:
https://thumbs.gfycat.com/DependableCompleteAdouri-mobile.mp4
This was a joke but if it came less out of left field I wonder if something like that could be pulled off. Probably not in the scope of a fanedit, though.