Lets pretend the devs posted a user poll for the next time you log in.
"Greetings Warrior of Light,

We have found a way to add 25 more slots to your inventory. Would you prefer:
A. Fishing Tackle Box
B. More armory chest/equippable gear space
C. More general bag space that can hold whatever.
D. Other

Thanks for your reply,
The Development Team"
If that were a real thing(and lets be clear, its not), are you going to honestly tell me you would pick to add space that can only hold one specific type of thing rather then anything you wanted? I am certain that some small percentage would say yes, but it seems obvious which would be the more effective use of any new space we got.