Except mythic raiders actually do only make up a very very small portion of the game's population. So they are absolutely a minority.
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There is literally nothing suggesting that the RNG will get better. This change actually makes it WORSE. With bonus rolls you had two chances at gear, therefore you had a much bigger chance at getting gear you wanted from a boss. Taking that away makes RNG feel even more terrible when your one chance every week continues to fuck you over.
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Yup. Shadowlands is looking to be just as terrible as WoD. Possibly even worse.