The instant 0sec casts worked when the .ab ex mode was enabled on the server. After its removal and Disrupt changes, the class mechanic is just as broken as useless like back on live. [just like the good old days, eh... t. formerly grumpy shaman from live]
I mean you could still go usual heal spec, but any attempt to use Balance Essence or even AP drain on a target that either has high Willpower, Block or stacks DeftDefender is more or less guaranteed failure - even if you stack max Int for maximized strikethrough value, you won't getting any reliable dps-healing done.
On the other hand, you also become immune to enemy magic by spending 10-20 renown points in Disrupt.
