This is a design compromise to knock out the
worst offender in ABM cost, by requiring a node
that must be created by player action instead
of ubiquitous naturally-occuring nodes that all
need to be checked.
Leaching is really meant to be more of a minor
gameplay element anyway, for either skyblock
purposes, or for people who are bored enough
that they want to take on a challenge like a
neutral eco footprint; most normal players just
gather the materials from mapgen and hardly
bother with leaching recipes anyway.
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