My reasons for capping them is because usually at the beggining of a new expansion you can desynth the vendor gear for leathers and other items initially early on at a profit before the price drops.

And secondly if im understanding this correctly you no longer need to desynth specific items for example shield for armorer and job specific items to level it?

Like if I switch to an alchemist and desynth a chest piece it will level alchemy desynth? Is that true or does it still have to be specific?