A miss understanding, apologies.
You're right, I spiralled off the subject. For reply, cheesing mechanics has always slipped in throughout the years, shouldn't be plausible, but SE has supported it. Changed the system, 0 Damage: No debuff, barriers as you know, treat it as 0 damage till broken, overlay barriers: no debuff. Oblation + TBN merge is fair, it's a filler ability.