Not true. If you read the linked post above (Tam's one on Accuracy being harmful for tanks). Special Melee attacks have a base 95% accuracy (his examples being Double Strike and Spinning Strike). Presumably to offset the base 5% Defence chance.
That was my point. It's 100% base chance to hit before factoring in enemy Defense chance. You only need enough accuracy to offset the target's defense in order to hit with every special attack you make. Anything beyond the 5-8% (I've heard/read numbers that vary) needed to offset that Defense chance only serves to reduce the chance of missing with your basic attack (which is almost completely negligible improvement in DPS, no matter the class).