
Shinigami02 |
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There's really two ways I can see it being explained, since I don't know of any official reasoning:
1) Adamantine Alloy is, when compared to raw Adamantine, kind of like comparing Steel to raw Iron. Iron's good, but Steel is better, and likewise the Adamantine Alloy is more effective than raw Adamantine would be.
I think there's stuff that goes against that somewhere in one of the books though, so the other option:
2) It's a few thousand years past Pathfinder. Metal refining has gotten much better, allowing for metallurgists to work with something closer approaching Pure Adamantine than what their relatively primitive predecessors were using in Pathfinder days. And since by this time it should be relatively simple to examine the effects different elements have when alloyed with Adamantine, it should be simple enough to create an alloy that stretches Adamantine supplies as far as possible while still retaining that strength that the purer-than-Pathfinder-era Adamantine possesses.

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I think that any in-game, lore explanation that you come up with will be a stretch and require some mental gymnastics.
I believe that the true explanation is from a design standpoint.
In Pathfinder the greatest non-magical substance is adamantine. It has a hardness of 20 and, by Pathfinder rules, the hardness of a substance a weapon is made out subtracts from the hardness of the object it is attacking. This allows a weapon made of adamantine to ignore the hardness of any nonmagical substance. This allows the destruction of walls to be an easy and quick process.
In Starfinder, as far as I have read, this is not the case. Materials' hardness cannot be overcome except by Penetrating weapons. This mechanics pretty much completely prevents an ease of going through walls (or things the story doesn't want you to).

Shinigami02 |
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It has a hardness of 20 and, by Pathfinder rules, the hardness of a substance a weapon is made out subtracts from the hardness of the object it is attacking. This allows a weapon made of adamantine to ignore the hardness of any nonmagical substance.
...Pretty sure this isn't a thing, and Adamantine's ignoring 20 points of Hardness is unique to it.