Actually we only meant level and defense related damage modifiers but we're not going to tell you that because apparently not normalising the bar stats and gear perks is the way to go even though legendaries and exotics tend to have ridiculous groupings of those. Auto-shotguns, exotic fusion rifle with max impact but min charge time, exotic auto rifles with humongous groupings of rate of fire, impact, stability, range are all totally balanced. They 100% don't need normalisation oh no.
I don't even want to get into the BS of semantics that is having the impact stat being the base bullet damage (why? It sounds like a stat to do with actual you know, IMPACT as in knockback effect - which before someone told me what it actually did was backed up by the fact that my high impact hand cannon had good knockback/flinch so I assumed that was what it did) while Attack only for level and possibly defense differentials (I've never been sure how it works because it's not explained anywhere I could find...).
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"Level Advantages disabled" only refers to Attack & Defense plus the weapon multipliers. When its disabled as well all weapons do the same base damage, atleast if I remember correctly. I don't have the Strategy Guide in front of me unfortunately, but Impact may be only difference. And mods on weapons are still enabled, meaning your weapon can have more control or less spread than another's. I think a lot of peoples problems are they think this is Halo. It may be from Bungie and feel like Halo, but its not. Were not going to see a equal playing field when it comes to weapons, or gear. If you have amazing gear, you will have a slight advantage. Bottom line. It matters what you bring into battle.