Definitely agree with this - as this conversation came up again with Snowy Parexus and Furcacuada. If you're in 90 Gear, highly, highly recommend utilizing surface slap with Angler's Arts stacks for makeshift bait. You can up your average webfooted sand gecko bites with it.

Also, to add, we've found that while it does add a fish to the pool, the bite rates do change when you add the quest fish to the pool. We believe that big fish in this holes are designed around the assumption you have completed the question. So it's not a complete and utter disadvantage and in some cases has been found to advantageous TO do the quests. For example, it's slightly better to have done The Studium and to add Garlean Clams to the pool for Snowy Parexus as it leads to more consistent 3-cast intuitions.

But, like I said, I agree and would prefer they go back to the either the ARR/HW style where the fish are in from the start regardless if you've done the quest. I personally, still recommend folk do them for the EXP, but that's just me.