Says who?
You?
Do you have even one shred of evidence to back up this claim?
A quote from Supercell staff or one of the developers would be nice.
You should submit that one to this site, I bet they'd include it in their list:
http://www.redherringexamples.com/
You can also place a rage, healing, jump, or freeze spell on the map without placing any troops and end the battle. Supercell does not force you to place troops on the map.
Another red herring.
Let's also check out how the description of the Lightning Spell reads: "Electrocute your enemies with bolts of lightning!
Cast this spell at the enemy village to damage buildings and units inside a small area."
Absolutely nothing is said about it being "intended"
only for the purpose of being used with your own troops.
Nonsense.
If Supercell didn't want a spell to be able to subvert defenses, they wouldn't have even created the Lightning Spell. The
whole point of the Lightning Spell is to be able to place it anywhere you want on the map to cause damage.
If your main goal is to gain trophies, you obviously want to cause damage to buildings to destroy at least 50% for a star.
If your main goal is to gain resources, you obviously want to cause damage to resources buildings to gain resources.
The Lightning Spell does not discriminate to what it causes damage. Nor should it.