Well a leveless design is certainly more risky than having levels. A more sandbox type game is more risky. As you said, the destructible environments a risk. Some other choices are debatable like their skill choices and whatever trinity or non trinity model they are going for. They are taking much more of a risk than making a generic wow clone #1678 (although I don't really believe in most mmorpgs being wow clones, it's just propaganda by the whiners).
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Indeed. I don't see much issue on this website but some others like the one I mentioned...oh boy what a mess.