As a crafter, I think almost everyone will help your friends / LS to make large volume low rank parts. Its low sp or even none, your fail % lower then 1%, and really time-consuming.
So why not allow crafter to make these low rank recipes automatically?
For example, if I had 100 fine sand and fire crystal, and I am Alchemist rank 30, then I would put all 100 fine sand and the fire crystal once, press "auto-cratfing", and let the system to do all synthesis to make fire shards automatically.
Of course, this will make crafter convenience and should have some limit, for example:
1, crafter would only auto make recipes which is 10 ranks lower then the current job rank
2, no sp provided for the auto-crafting
3, no HQ output for the auto-crafting
4, successful % depends on the current job rank (just like to repair item)
So this function will help crafter's life, but little affect on the job balance.