First, i would like to thank you one more time for this amazing mod.
And now the question, why smeltery is basically "weaker" than foundry.
For example, direct molten iron/copper from lava. I understand that the difference between iron/copper per second is because the difference in productivity bonus.
I would suggest to increase crafting speed to smeltery to compensate the lack of productivity. At least that would make sense to use it.
Or make the calcite-less technology separated from smeltery technology, dunno.
Thank for your time.