Why is the displacement missile not needed to get the most out of an asteroid core?

I feel like there is a missed opportunity here.
Many people like the mechanics of this drill missile, but you can't really drill anything worthwile.

Why not add some subsurface deposits on the inside of motherlode asteroids (containing the new valuable resources)?
It would give the drill a use.
Allow for the collection of an extra 2 or 3 tons from a core, that would be just enough to incentivize the use of the extra hardpoint.
 
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