This is based on what exactly? I mean the beta doesn't support this at all. This is the hopetimism many here had around Dragonflight, but as of now it's based on basically nothing. Where does this sentiment come from?
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All of what you listed is just an improvement of already existing stuff and not new. I don't want to degrade that per se, but it definitely is not a new approach or innovative new max level content, which was the thing a lot of players in this thread expected before we got to see what really is there. Again, because a lot of peopel just seem to overlook when I write that: Blizzard improving the base game systems is mandatory and good. That was never in question.
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How do they? Most specs still function and play exactly the same as before.
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Feature vs. content discussion. Read the initial post I replied to and you should understand my answer.