An idea out of nowhere

I had just to wait to get an idea for TNR?
Ugh.
The idea i had is to fix issues on the skill system.
I were playing a game where skills have chained attacks, but i ever noticed that the damages are always so fair.

Then came on mind the idea.
First, i calculate the total damage that the skill will cause, then, for each attack, i get it's percent of damage to show to the player.
Isn't it a good idea?