Quake Spell upgrades??

Why do earthquake spell upgrades if it is going to take four spells regardless of wall level to destroy walls. That is absolutely unfair. If my quake is upgraded it should take fewer spells to destroy the lower level walls. I consider the quake spell to do the same as a wall breaker. Please explain Supercell??????

Wrong forum for questions like this.

Would suggest looking up strategies forum, or YouTube videos about it.

In short, it does a good set percentage of damage to buildings, but only practical on the first hit. It tips things enough for a TH8 to take out AD and still have enough for a rage spell for mass dragon attacks, among other tactics.

It is really good for those 'almost destroyed' buildings, like a near dead defense that could make or break your attack.