Enhance the retainer storage as a great solution
The current issue, and pet-peeve to all players involved with crafting is:
1. Stack limit
2. HQ/NQ
To be honest, the stack limit is acceptable. The mix of HQ/NQ is NOT.
Crafters always have a mix of HQ/NQ items, and when L50 and beyond, creating HQ from NQ is simple. In addition NQ mats with crafting skills can make HQ items and gear without a fuss, but you need 2 slots for that.
Option 1:
Create a "shared stack" (up to 99) with an icon with a diagonal line, indicating a shared stack of items (HQ/NQ), allowing the player to take and remove the stack. Should it be removed entirely, from the retainer, the stack breaks up into the 2 separate stacks HQ and NQ
Option 2:
Allow a stack of 99 each in a shared icon. Players then choose to remove either HQ or NQ animal hide, for example, from their stack, saving space and keeping the storage limit.
Suggested 3:
Crafted items, GEAR specifically and by the player only, is allowed to stack to 9 ONLY on the retainer.
Fundamental changes not so fundamental
I agree with your comments, i like the "cold storage" idea. But the technological change from a coding point to have a shared stack cannot be that hard to implement. Each retainer slot has a "hidden stack", the end. Nothing more. still only 175 slots, just a condensed slot for HQ/NQ items of the same kind.
Your comments about Omni-crafters is quite true, we have to refine the use of our retainers to such an extent that we have to keep out NQ and/or raw materials.
I spent an entire weekend shrinking my CRP/WVR/GSM/LTW storage by crafting all raw materials + required mats into HQ items only. Big space saver! but now I am using HQ mats when crafting L1-30 items... which is a big waste