Watching other people read Levitz' LoSH for the first time really reaffirms the feeling that modern cosmic DC has gotten incredibly dumbed down. Levitz and Giffen (and others, but particularly those two) put so much effort into making different worlds feel unique and as complex as the format would allow without becoming a lexicon, but recent stories have treated these planets as one note curiosities that at best exist to be backdrop to a story that has little to do with them or at worst to blow up.
I know how comics are, but despite everything it doesn't feel wrong to expect them to be able and willing to acknowledge foundational work like that. You don't even have to read LoSH to understand it, it's literally in the online wiki one online search away.
And as much as I hate what has been done to Colu, Naltor and Daxam, it must be Durlan that has suffered the most. Aside from the seeming erasure of the Six-minute War, which in itself carries no less meaning now than during the Cold War, it's incredibly strange to take a population that has always carried themes of being ostracised for their inherent traits and confirm that yep they've all been using those traits to be evil and infiltrate the government the entire time. Also some evil colour spectrum mumbo jumbo because clearly we needed more of that.