As a question, why as a thing does a tackle box specifically have to be an off-hand? (Also it's been mentioned before by devs that allocation more inventory space to players is a tricky thing to do without impacting server load).

2. And for the love of god no I don't want another slot of equipment for fisher with stats, because they've already displayed that their objective with fisher is to push us to maximize our stats with each patch if we want to catch everything - which means that it'd just be another massive chunk of gil investment that wouldn't make things any easier either.