According to wiki, the tanning formula is qLeather = (3*qHide + qBark + qWater + qTub)/6.
this requires 1hide, 1bark, and then 60L water
The process demands much more water than the other materials, so it would seem reasonable to have water play a lesser (or greater?) role in determining quality.
“A designer knows he has achieved perfection not when there is nothing left to add, but when there is nothing left to take away.”
What? How does it demand more from water, when water is playing an equal role? The Q of water barely effects the Q of the leather produced. Take a Q160 hide, Q100 tub, Q100 bark, and Q10 water. That's still Q115 leather. Or even with Q200 hide, Q200 tub, and Q200 bark, Q10 water is only dropping it by 32 points of quality. That's hardly a significant role, and it's pretty easy to find Q50+ water to push that to Q175+.
Or are you suggesting it be something like ((2*qHide)+(2*qWater)+qBark+qTub)/6?
(I admit I had to edit this, because I didn't even think of the fact you're adding 60L of water to a tiny piece of bark. But also, "realistically", the hide doesn't absorb much water at all, and water, in fact, has no actual role in the quality of the leather)
Well anyways in reply to the OP, I agree completely. Tanning requires too much water, even if you're just doing 1 or 2 tubs which is only a small amount of leather.