Ehm...before i treated selfdamage like nothing. Cause NORMAL Frame build means fat mods/defense mechanics. Like 90% dmg reductions or 2500 armor or alot of hp and etcetc. So, that damage was almost never lethal (maybe only on thing like Bramma, but then they nerfed it and also added reduced selfdamage mod, so....). So, selfdamage wasnt a problem. And selfstagger is. You now need to use mod (also locked behind huge grind for lower players and also using ALOT of energy in mod config which is freaking awful) SPECIFIC just for counter it. While before you built fatness just cause you was already doing this for surviving vs hard enemies.
Selfstagger is much worse that damage.