Voadam
Legend
This assumes everyone plays the same way.
I think it was more focused on turning aspects that had been in D&D lore but were hard to interact with and making them immediately gameable to most groups. So the elemental plane of fire had been a place you could go in 1e-3e, but only if you had enough magic to make you immune to constant fire and able to breathe fire air. A 20th level group without the right specific magics will die in a matter of rounds from environmental exposure. There is neat AD&D lore about elemental powers and efreeti and azers and such, but it is fairly hard to interact with stuff there directly. The 4e Elemental Chaos is designed so that it is not just a neat elemental planar concept but a place that most adventurers could conceptually just go and adventure.