Emo hair power!
Different expectations. The Abyss, and demons in general, are heavily sword and sorcery flavored with a strong trend towards the natural world taken to predatory extremes. More artsy conceptual ideas aren't really part of it's paradigm.It's also that most of these domains don't really come across as the materialised vision of a mad warlord from the plane of chaotic evil.
I know it starts to sound a bit more Exalted than Pathfinder, but if that's the way these regions come about, I'd expect more shit like jungles of ice populated by crystal hummingbirds that drink hope.
Or maybe it's pragmatic for a Demon Lord to be closely aligned to Material Plane phenomena? Makes raising a cult easier if you're the Ape King of the Jungle than if you're M'krylth the Walker on Obsidian Serendipity.