In my exp Quelling Strikes never need to be use when tanks do their job good enough. even in the end game stuff over gear or not in the pass the only times that pose some problem with proper tanking was when I play blm and do triple flare!!

After the expansion I never have a chance to do that!! Tanks than cannot even keep aggro from smn using bane (not to mention painflare and deathflare) still to be found quite often. I don't think you should blame this mater on us, like we shouldn't blame the fail of DPS check in some boss to tanks and healers