Making things up again. He was talking about mobility being useless when you don't have proper instant casts. FYI, because you're clearly clueless: Empower abilities don't work with Hover. So the longest casts Evoker has. Yet he's not a turret?
Anyway, that's all you got? That one post? Then you're simply a liar. Nobody is calling Evoker useless, like you claim.
Why not now? Come on, do it for the science. Name encounters where an Evoker would have an advantage - there are so many to choose from! We're just casually talking here about specific scenarios where an Evoker may or may not have advantages over other healers, so give us some of your valuable input.
And BTW, what about that video? The one you've linked - with the guy talking about Evokers feeling terrible in spread fights and literally saying Blizzard might have to increase its range to 40 yards? No more comments on that? I thought you value this guy's opinion.