As I wrote when this first came up, the entire discourse about 'wasting' the Void Lords or it even constituting a twist is nonsense:
The Void Lords have no presence and no narrative effect. Their existence is, save for a few documents, relegated to the Chronicle description of them as nameless, faceless Old Gods +1 who chuck the Old Gods we know into the world, who then do the actual work. The threat they pose isn't just analogous to an Old God with the power of the World Soul, it is identical, because that's their means. None of them ever appear, none are referenced, nothing was done to differentiate or set them up.
Even calling it a retcon is a strain for me because again, this had no reflection in the way anything at all was written. No effort was made to build up to us fighting Void Lords (wisely so) and Dimensius was a threat because he was a big monster destroying the place he was famous for destroying and then threatening the world, not because of his unique status. The route they took was already about the best you could do with this kind of big threat, precisely because it avoided the pitfall of the Bald Man of shifting the weight of the conflict towards a new, undercharacterized satan figure. Dimensius wouldn't be better if he was Amon and he could never be Sargeras..
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If anything, SL hate is lighter in this thread than it is most anywhere else, since anyone still discussing the plot compared to the many who lost interest must at least tacitly tolerate SL. I'm a moderate too as I consider SL's story to be merely shit in a fairly baseline Blizzard way, rather than uniquely shit.