Do Thok kiting is same on 10 and 25? From middle to tunnel then back and forth? You can do 5 full fixates and no gate will help you on 6th since it will reach wall. We never needed it to help kiters, I used it only for person running back to stack group (which Priest Leap would do same) and so that our hunter can get through boss and cheese fixate on himself. Healthstones are god-sent though for fixated/nontopped people. I agree on Blackfuse, kinda. We had setup that could stay on belt all time so we didn't need it. On Garrosh, I'm person dealing with engi, I use gate to get more uptime between aoeing sets of adds before dealing with it. I run from engineer to grouping point on feet though (with Sprint) and times I aggroed wolf rider maybe 3 times in hundreds of pulls. Unless 25 man have diffrent aggro radius *shrug*. And we had no way to keep empowered adds off people before Iron Star came so it ended up to RNG wheter or not we pull to next phase w/o losses.
For the lock thingy you would need to know history on Xelnath on warlock forums. Short story, he was dev behind most changes and got fired in mid-MoP. Now they start cutting seemingly random things from locks, mainly Shadowburn mana regen, with tweet from Cel saying 'Cast Time isn't mana regeneration so it's just complication'. Anyone playing Destro lock will tell you how clueless he is as we had no mana return on SB early on until it got hotfixed in as we couldn't use our execute and went oom (making Chaos Bolt always go-to spender). Fel Flame removal is other one (Affli can't deal with totems/mc without it for example).
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I'll tell our ret pala to stop using Devo and BoP on Thok, clearly he doesn't know what he is doing. Dps bring dps to beat enrage timer and utlity to deal with boss mechanics. If you have 2 same dps classes and one bring healing/utility and other doesn't, you take one with extras, always.
Read Celastalon tweet, he recently was discussing utility of different classes. It is important part of dps toolkit. That's why in WoD all dps spec will deal same dps but also they all get cutted down to (or gain, mages and later ww) same utility.