It is and always has been.
Blizzard has friends in the gaming community (obviously) and those are usually very high end raiders or PvPers.
The first week has always been the “something is exploitable” phase, where those “in the know” run amok and SOMEHOW always seem to know what to hit and where.
Then, like clockwork, Blizzard will come sweeping in and nerf the thing, but let those exploiters off scott free with their “bonus” stuff.
Same way the drop rates on things are super high the first week of a new zone (to allow high end guys to get what they need from the new zone before the new season starts) then nerf’d right off a cliff after that.
Been playing and watching for almost as long as the game has been a thing, seen this play out WAY too many times for it not to be intentional.