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Actually it makes it easier for scripters and harder for players
Nope, it makes it harder for scriptors since they have to take the randomness into account as well.
Before they could guarantee their hauls of whatever metal they were targeting that day (Shadow, Valorite, etc) simply by having the appropriate veins marked.
Now they have to HOPE the veins produce (and keep producing).
The ONLY real advatage a scriptor has over a player is the lack of fatigue (mental (getting bored) and physical (getting tired)) whereas before they could keep the desired veins farmed and not only provide themselves with endless "rare" ore/wood, but deny the vein to legitimate players.
I have seen FAR fewer script miners where I mine after the change than before because it's no longer as efficient to Recall-Harvest as it is to Strip-Harvest.
The resource randomization was basically two-fold... Return rarity to the upper end resources and to dampen the effect of scripting.
Based on the reaction, it is doing both of these functions.
"What about Ore Carts/Stumps?"
Well it is true that they give an equal chance for all resource types, but only 10 per day.
For example, I have 20 ore carts (I have 22, but let's use round numbers here and go with 20). Each one produces 10 large ore per day. Assuming I harvest each cart BEFORE it maxxes out at 100 and do this for a year, I end up with 73000 large ore (20*10*365). Divided by nine ore types, that's 8111 of each type. So if we multiply by 2, that's 16,222 ingots of each type.
Breaking that down further by smelt chances at 105 mining (100+ gloves) you get:
16,222 iron
16,222 Dull
16,222 Shadow
16,222 Copper
16,222 Bronze
14,600 Gold
12,978 Agapite
11,355 Verite
10,058 Valorite.
Total ingots: 130,101
So you can get 10,000 Valorite per YEAR if you have TWENTY carts.
In mining, a good run of strip mining will give you at least double the Valorite and a MAGNITUDE more of the other colors.
In LUMBERJACKING, there is a MUCH greater argument due to the apparent distribution of wood that even a couple of stumps will serve you MUCH better for the higher end woods.