I have, plenty of times, with retainers that are well geared to bring back the more top tier loot and even though there are less fish, its still mostly just meh.
My retainers are basically there to bring back materials for crafting or for resale. I could take the chance on quick ventures or I could get actual items that are worth a lil more, like soil, and actually make a profit or get something I can use rather than trash gear I trade it for seals for yet more ventures, junk I vendor or desynth for tier 1 demi materia.
I have 8 retainers, I can send them all out for quick ventures multiple times a day and get maybe 1 good thing every few days, that sells for maybe a few hundred thousand, or I can send all 8 out for worthwhile items I actually need or can make real gil with.
