Deleted User - 1759805
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I don't think the actual current WW percentages are in question - I believe many people verified these as long-running averages (at least for diamonds). The point is, unlike event chests or mystery object these are not officially stated. This means that these can be adjusted at any time without notifying anyone, as no one ever promised that you're going to get, say, 10% chance of diamonds from the WW.Dony doesn't guess about such things. It's either viewable from the game files or he got it from an employee.
I'd sooner bank on his information than a support ticket or a post from a volunteer forum moderator.
Not once in 3 years has he shared bad info.
Now they probably can't do the same with the mystery object without making changes public (at least by changing the description) - and hopefully some warning ahead of time.
It's like relying on undocumented/unsupported features or API. Sure, it works - until it doesn't, and this can happen suddenly and without warning. Many a tear has been shed this way