Before Lucis, a full set of fully melded Forager's gear, along with HQ food was necessary in order to catch the mightiest of the Big Fish, unless you used the Free Company buff (in which case you could get away with a partial, or not-fully-melded set).
For Miner/Botanist, though, yeah, you can manage even the highest nodes without it, though as always higher stats means better gathering rate and higher HQ chance.