Armor Thoughts

[Lisif Deoral]

Does anyone use emissive armor?
I think it's almost useless, since damage from fighters isn't applied with every single shot but summed up for each attack routine, and (almost) every other weapon causes more damage than its damage tolerance limit. Or does the ability to ignore damage of 20 points or less stack? (i.e., 20 points with 1 armor component, 40 with 2, 60 with 3...)