Most of the hexed synths overlap half of the same GD ingredients at this point anyway, so sadly having the capacity to dual crafts to 110 would moreso force you to confront the question of "Do I want to use these mats to synth this hexed item OR this hexed item?" as opposed to opening up significantly more synthesis opportunities by allowing you to utilize a pool of ingredients you hadn't formerly been in the market for.
Of course, some wiser choices would be more practical -- such as having bonecraft and smithing both at 110, since the limiting reagents don't overlap, as opposed to smithing and leather, which essentially use the exact same ingredients to make all of the tenryu gear, but simply require different maxed crafts.

