99% of the rocks can't be mined with the new tools. The large majority of rocks won't glow by the scanner, and those won't have anything to harvest. All the other dull rocks can only be mined with the old laser. And the stuff you get from those relate to almost all mining missions. So to remove the old laser is to remove most mining missions and the market for them.
On the other hand, most of the surface and sub-surface deposits are the stuff that is required in mining missions and last night I found a core deposit of Bromelite.