It also helps lessen the need for excessive overmelding to reach certain caps or makes new caps accessible to those who have overmelded. Things have only been getting better for non-Omni-Crafters. If you don't agree, try Crafting any of level 60 Recipes with no Specialist and no cross-classes.
The only thing this really does for a high-end Crafter is to reduce the amount of materia they need to meld (If they haven't already). Trust me when I say at higher levels a small boost to anything besides CP only has a small chance to change anything in a rotation, and even then it would likely only add 2-4% Quality.
Anyone can become a "top-end" Crafter because there is absolutely NOTHING they can do that will stop a dedicated Crafter from making gil.