QA Assurance team isn't a dev team, we're just a bunch of guys that are willing to test in another realm, the bugs that have been reported and if they're fixed already. Our job is NOT to figure out if another thing got bugged when they fixed this, it's impossible to do so until you play few arenas or anything and you realize something got bugged. Most of the bugs that pop out of a fix have nothing to do with the bug itself. How could we have known that when they fixed warrior's charge pathfinding, it would also make it follow ppl thru gate? Makes no sense, you'll realize when in an arena this random thing happens, so if you want someone to test every single skill before a fix goes live, stop whining about it and apply for the QA team, and do it yourself. We have no coding skills and no server management skills, just ingame knowledge, that allows us to know whether something is bugged or not, report it, and test it when gm's tell us to do so. Please, just go away, you make 0 sense.
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Now, regarding to the actual post, its not only warlock's pet that gets bugged. Mage's pet takes a shit ton of time to get out of dalaran sewers, which makes impossible to root the enemy so they can't stop gate if you're playing with a warlock. Also, they get bugged inside a pillar sometimes and they don't move until you summon a new pet, which means you can't root someone in the other side of the map. Hunter's pet bar sometimes disappears and makes you unable to use Sac or master's call, 2 major cd's for hunter. Those are the ones that I can recall atm, there are plenty more for sure.