The casting debuff being removed by healing, casting debuff making it harder to remove stacks. The biggest point is at this stage in the game YOU HAVE TO HARD CAST TO CLEAR STACKS. HARD CASTS ARE DAMN NEAR IMPOSSIBLE WITH AN UNDISPELLABLE CAST SLOW. And yes I know you can CC the dk and let the stacks fall off, but guess what. You can literally do that with any class to avoid damage so that is irrelevant. I've gone over it but everyone keeps linking the same article without reading just about anything I've typed. Notice he mentions nothing about the cast slow. Or how a match actually plays. It isn't tug of war. there are mechanics involved.
But whatever. I don't expect anything to change. Look at warrior stupidity right now. This is <1% of the issue warriors bring to caster dps and it's gone on this long.