Let’s say the RNG sucks. Vs. and energy/heat mech, which has 22 physical resists (unless you use Zarkares), it churns out 181 damage and your opponent’s resists go down to 7. Next turn, you do 196 damage and drain your opponent to -8. You then deal 211 damage, a total of 588 damage from one weapon with 3 uses.
On the flip side, it can deal a max of 1002 damage for 3 uses, though.