Is your argument a good one, though ?
Bear with me here for a little, probably a wall of text inc - I know it's annoying, but it's hard to explain everything without explaining it completely. Mages and Warlocks were historically THE two caster classes that were a staple in arena and in PVE since the inception of the game, they're the two sides of the same coin, with Shadow/Ele/Balance representing spare change ( Warriors/Rogues being the other major coin, and all other melee being spare change ). Those two coins, the melee and caster one, represented classes that were ENABLERS ( enablers enabled other classes to work in arena, in a world where without them, they'd have not a single tier 1 comp ).
On S15 and Warlocks :
On game balance :
On your and everyone elses opinions :
If I was Blizzard, I'd disallow queueing double melee AND double caster unless I took specific steps to make sure that all 3 comp archetypes were properly balanced ( with the exception of double healer, I'd never allow ANYONE, EVER, to queue that ). When everyone swapped to Shatter during S8, I was the only Spriest left in the world that was above 2700 and still played melee/caster/healer. I caved in once the best mage on my battlegroup asked me to play 3s, and I didn't lose a single game from that point to the end of season in 3s due to how OP double caster was ( and I still regret not getting R1 that season, but that Mage was somehow satisfied with not playing the game and only getting Glad ). So trust me when I say that I don't like double caster as much as you, but I also despise melee cleavers who demand rights in this game. Fuck you double melee, fuck you double caster, shut the fuck up and sit the fuck down.
edit : added spoilers to not make the post feel threatening to people, but even with spoilers, the visible parts still feel like a menace, lol