Our contention has never been with Balance mobility, it's about Hunters and Fire/Frost Mages who are leaving the rest of us behind. I would be less concerned with how Warlocks are on old content and more concerned about the still-remaining mobility gap between ranged specs.
Between Balance, Affliction, Demonology and Destruction, only one of those specs has unconditional and spammable damage on the move.
Boomkin are free to Moonfire spam all day and Starsurge charges can bank safely up to twice.
Affliction can....refresh two DoTs, neither of which do damage on application and are thus practically pointless to spam.
Demonology can refresh Corruption which does no direct damage or spend Fury on Doom and Touch of Chaos (the latter of which is often a waste of Fury). Nothing spammable.
Destruction has Rain of Fire every six seconds and Conflag that you can safely bank once. Nothing spammable.
KJC is really the only thing propping all of our specs up in WoD, but it comes at the opportunity cost of Archimonde's Darkness....which is arguably stronger than Live KJC, let alone WoD KJC.
We have some options but the rest of them are tied up in things like resources, requiring melee range, or come at a hefty opportunity cost. This is why "unconditional" is a really attractive thing.