the iskar assist is a non issue, you could add the debuff to your raid frames and just have people watch raid frames for debuffs instead.
Many raid frames addons (like VuhDo) can even make individual raid frames change color depending on conditions, like a debuff, so for example I could make it so that those in my raid that has any specific debuff would turn out Purple (or any other color). All Iskar Assist did (Exorsus Raid Tools) was to make it easier by everyone getting the same addon instead of everyone altering their raid frames. The big problem with the current addons and WA scripts is when they show you positioning- almost to the power of AVR back in WotLK, this issue is very easily spotted in Archimonde where the addon(s) break the encounter mechanics by trivializing them.