So basically, we have GC admitting that Haste is only good for Invo when IW and RoP get increased MP5 from it, admitting Blazing Speed (in any form) is too powerful, so they created this AWFUL new version that replaces Blink, Invocation in it's PTR form is too powerful and its mana will probably be nerfed, RUINING Fire/Frost completely, and a tier bonus that nerfs Arcane more than it buffs it.
Why exactly is this dev team (assuming they all worked together on this) still working in the industry? It 100%, undeniably, PROVES that they have no idea what the Mage class is anymore. They think this is "fun" when most Mages are not, actually, having fun, suffering the worst QoL issues over any other class atm, have a broken specc (Fire) that their lead dev continues to argue is perfectly fine, and they can't even get the L90 talents right, which were horribly designed to begin with. Not to mention, too many core mechanics exist for all 3 Mage speccs, the biggest one being the L90 talents, all of which deal with MANA. This means it's directly tied to Arcane's Mastery, and each one scales it differently. If one is too OP, then they nerf it, causing a backlash towards Fire/Frost, WHICH SHOULDN'T HAVE TO DEAL WITH MANA. IF WE WANTED TO DEAL WITH MANA, WE'D PLAY ARCANE OR A HEALER.