They could make space in the oft-empty Key Items tabs. I use the expanded inventory screen, and it shows me three tabs for key items, and one for crystals and shards, and at MOST I have maybe a dozen key items handy -- and that's only when I'm doing Ixali quests and picked up my hunt logs at the beginning of the week. That's it. They couldn't even put Atma in there, so there's no reason they can't free up one tab and give players in general more inventory space if not fishers specifically.
Or they just haven't given a good reason from a dev standpoint not to. Fishing is more popular now due to desynthesis so... Get on it, please!
