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Originally Posted by MagicalMeddler
Two things: By that logic, anything made out of iron requires that we re-create a planet.
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If you just have an undistinguished bit of it, sure does. Or possibly the entire universe. Certainly anybody arguing you can recreate something from a single atom has this problem.
It's a problem with any definition of the Rebuild spell, since most "objects" are potentially bits of many different things. Just look at that bit upthread about the sheet of paper originally being part of a big roll of paper from the mill. If you Rebuild a torn page do you get the page, the whole book, the roll of paper, or the genetically engineered tree the pulp was made from? Why one or the other? How does the spell know if you want the page with or without ink vs. dirt? There are controls you can put on Rebuild (e.g. since it's rebuilding it has to be an artificial thing, it has to be the most recent recognized "thing" and can't make "copies" since the artificial thing only has one "item soul" or something) but that doesn't solve the problem for creation magic in general.
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The spell was included in the Grimoire and kept in later editions, so it's there for some reason.
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It is, but not an economic one. No spells are actually vetted for economic applications. That's true in basically all games ever, the spell lists are written for cool adventuring utility, not as part of a worldbuilding exercise.
I'd also note than many spells in Grimoire have had a reputation as unbalanced, poorly thought out messes ever since the book came out, so arguing "it's there for a reason" isn't going to fly with most long time GURPS players. Maybe there was a reason that made sense in the context of whoever's campaign the spell first appeared in, but it may not have been rethought since.