Main targets of the attack were components of electirc grid, hence relatively low casualty numbers. For some reason western media mentions this only in passing, while pushing what seems to be the misses to the front page.
Cruise missiles are pretty expensive. (The US Tomahawk costs about $2M) My understanding is that ballistic missiles are even more expensive (The 9K720 Iskander costs about $3M)
If you are trading these for $50M fighter jets that's one thing, but spending them on transformer yards might be just digging a hole for yourself.
But yes, this time orcs also happened to hit parts of the grid. Which is still targeting civilians instead of military targets.