The attack value of Charge Coil indicated is 0 since you get the value of the damage in the description. However, if the attack is augmented with the priest for example, we don't see visually this value.
Therefore, keeping the real attack value updated in the corresponding field would be easier for the player to see the actual value.

The damage dealt by Charge Coil is not affected by Machine Priest or other buffs, actually. That's why the attack number is 0.

Thank you very much for helping me