Spinward Flow
SOC-14 5K
Simplest solution to that issue is to set up armor as being able to reduce D6 damage results to 1 per D6 ... but can't reduce damage to zero per D6. That way, "some" effects still leak through the armor protection (meaning, you'll "feel it" to some extent regardless), but it allows armor to "do its job" of reducing otherwise life threatening wound potential to being something you can live with (and potentially keep fighting through).The issue with most modern "armor" is that, as detailed above, even though it doesn't penetrate, it still causes trauma.
Advances in weaponry though (doing more D6 damage per hit) have ways of getting around that kind of "stopping power" of armor, such that even if the armor "works" to save your life, you're still going to be incapacitated by the hit (looking at you PGMP and FGMP weapons) and taken out of the fight.
You don't get that kind of more nuanced distinction from +/- To Hit DMs.