So after actually using updated Viper during raid reclears today, I can now say that it feels a little weird not having Noxious. It's not awful, but it is awkward. I'm okay with how it is now, but I actually would prefer having Noxious back. I won't be upset of they don't bring it back, but I will always kinda miss that minigame...
Edit: AoE does feel better, though. Not having to worry about making sure each enemy is marked while also not accidentally overstacking the debuff is nice. Man. Now I'm torn.