The progression isn't being done this exactly. It's not a perfect thing: the code the devs are working with has a lot of flaws and they are trying to fix bugs and revert changes that came really late (e.g. the new skeleton/wolf models, the shared bank, etc.) as well as get big things working like Plane of Sky and Kunark. They're not saying "OK we are in exactly month 8 of Classic, pre-Kunark, so THESE mechanics must be exactly like THIS, while THESE mechanics must be exactly like THIS"; there are way too few devs and the code is way too imperfect for that kind of specificity to be possible.
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