I will say, I never really cared for the Great Wheel. My favorite was the planar setup from Eberron. If you're going to have other planes as conceptual constructs, better to have them as actual identifiable concepts, rather than the already-hard-to-nail-down alignment grid. The 4e cosmology was nicely flexible, because you could create as many Astral domains as you wanted, and they didn't have to be tied to only one alignment.
Let's say you're doing a multi-pantheonic setup with the 3e Deities & Demigods collective. Do you put all the lawful evil gods in one plane, waaaaay over there, or do you have a cluster of astral domains tied to the pantheon, so you can have Hel, Asgard, Niflheim, Muspelheim, and so on in a linked group, giving a reason to have them all tied together? Especially when you have gods with a particular alignment, but nothing about them linked with the Wheel's planar description?
Losing CG and LE is kind of a blunder, but it does give room (especially in the trimming of alignment rules) to simply drop alignment altogether. Unaligned isn't going away, even if we get back the other 3x3 setup.