It does stack, but the effect is highly disruptable (see vanilla forum discussion link).
I mention it in the notes that dials and SoPa will even disrupt the effect.
This should be much easier to do in oEtG as well since procrastination and ice shield can freeze / delay a weapon and thus reset the bonus.
Moreover, we have a lot more choices in terms of shields, and a lot more CC and anti-weapon choices.
For instance, lifesmith and upped fluxor could forcibly fly the enemy weapon, resetting the bonus. You could also use "Give" to forcibly replace the opponents weapon (again, resetting the effect).
Lastly, even if the weapon itself is given shield bypass and made untargettable, you could still pick off the Epoch Forces directly (and give is always an option
)
This hopefully means that every element should have some form of counter unless a lot of effort is put into setting up a dedicated strategy...