Fisher does not need to be changed. Yoshida has stated several times that it was designed with stress-relief in mind; it's meant to be a hobby class. There are a literal handful of synths where fishing is somewhat profitable, but as a whole, it isn't by design. We have to pay for repairs and equipment too, and everyone forgets about bait. It's required and most of the time, it costs more than the fish it yields sell for at NPCs.

The other two gather classes are primarily aimed at facilitating their respective crafting classes. Where this is true to some degree with fisher and alchemist, there are ways around it and you're not backed into a corner like you are with the electrum, wool or cobalt progression in other crafts.

Honestly, if I was to request any change at all to MIN and BTN, it'd be to give us back the random shard reward each time we gather. Manually mining shards and crystals in ARR is just painful (and a huge earner for RMT).