Zombies of Melkor, Arise!

[Inziladun]

Aulë the Vala committed a sin in the vein of Melkor (though with better intentions) by presuming to 'create' a race of beings, the Dwarves, outside the design of the Prime Creator, Ilúvatar. He received a stern rebuke for his folly.

Why dost thou attempt a thing which thou knowest is beyond thy power and thy authority? For thou hast from me as a gift thy own being only, and no more; and therefore the creatures of thy hand and mind can live only by that being, moving when thou thinkest to move them, and if thy thought be elsewhere, standing idle.

Silm Of Aulë and Yavanna

Here is the issue: Why could Morgoth not have made a race of beings like Ilúvatar described, fundamentally mere 'hands' to do his will? They might seem to be excellent troops, something like the battle-droids of the first three Star Wars movies. What they lacked in intelligence and creativity could have been balanced by their unquestionable loyalty and potentially incredible numbers. Additionally, they would not have been subject to some of the failings of the Orcs, such as their sometime cowardice and greed. I'm not suggesting he might have made soldiers like in the place of Orcs, but they could have been a powerful supplement to the might of Morgoth.
Did those thoughts simply never occur to Morgoth, or was he happier with the Orcs, overall?