Originally Posted by
Mireille_Bouquet
The stats given up are offset by the reduced stats needed for fishing locations and spearfishing fishing nodes.
In effect, fishing costs less stats wise therefore you don't need mining and botany level stats, hence why fishers only have a +35 GP stat offhand instead of a +966 Gathering / +1691 Perception (Star Tech) offhand for miners and botanist.
If the devs decided to make the spearfishing gig a stat match for the other DoL offhands, then they would also need to change all of the L60+ fishing content and nodes to re-balance for that increased stat potential.