The only reason I am asking for Wool to have stacking increased is because it is very easy (like Logs) to accumulate lots of the item.
If one is using Majestic Trees, then you very easily get 1k logs, so it makes sense, stack logs to 10k.
The same can be said for Raw Stone, if you pick your house drill or mining drill you can get lots of Raw Stone and also Iron Ore.
The same is also for Pelt.
All these items stack to 10k, and are used in major crafting channels (gear (Weaponry, Carpentry, Plate and Leather Armor), construction etc) that are known to require copious amounts of raw mats prior to even making set pieces.
Why then is Wool, a major precursor to Cloth and thus Cloth Armor is left to only stack to 1k? the other crafting proficiencies enjoy better stockpiling capacity.
If you are using Sheep pens to get wool, per harvest of a single pen you will get on average 150 wool. But. many players fill out whole 24x24s or 16x16s and many multiples of these with pens, anywhere from 4 pens upwards, and eight or sixteen being not uncommon. (2 filled 24x24 plots)
A single harvest of these alone, if looking at the minimum number that are usually placed (4 on a single 16x16 plot) would give you 600 Wool, a full 6/10ths of the current stack limit in a single harvest! Now imagine you had a 24x24 (with 8 pens) you'd get 1.2k, 200 over the stacking limit.
So as you can see, in regards to handling wool it quickly spirals out of control if you are harvesting even "only" once per day. Meanwhile, other materials that are used in major crafting (iron ore, raw log, pelt, raw stone, for iron iron ingot, lumber, leather, and stone brick respectively) enjoy increased stack sizes. This is unfair on cloth crafters!
