It's quite bigger than that to be friendly.
For example:
I cleared 1st week Eden Promise fully crafted gear max melds.
When we trial some new healers without the crafted gear in a min ilvl settings which cuts off our melds, we couldn't even properly push the DPS check despite we were 5-7% behind our 1st week. Don't underestimate Crit/Direct rng, it's a right game changer.