It doesn't matter whether the changes are horrible or not. It is the declaration that this is a unilateral power from on high that is the problem. It is this dogged insistence in the utterly unassailable, unmoving, unquestionable sovereignty. I, like Gregory the Anarchist, do not scorn it for being cruel, nor (though I might) for being kind. I scorn it for being dictatorial.
It is possible for someone to be a benevolent dictator, and certainly a hell of a lot easier to be one when it's just you and a few friends playing pretend elfgames. That does not, in any way, lessen the fact of the benevolent dictator's dictatorial power. And I am opposed to dictatorial power on principle alone.
If there are no rules of engagement--if there is nothing whatever beyond the good graces of the person with unilateral power--I see a pretty big problem with that. I would have a problem with it even if I could know, with absolute and ironclad certainty, that that power would never be used for hurtful ends. There is only one Unilateral Power I'm willing to accept, and I'm afraid He isn't really interested in DMing (unless you take a rather oddball view of the nature of Creation, I guess.)