People don’t realize how easy it is to get into raiding in this game

[VeyaAkemi]

But that was already part of the design of the boss back then. I see what you mean in that now the margin is tighter since you can't afford to damage her even less than before, but when this boss was current people still had to stop DPSing her in order to focus on the adds.

The difference is that now the gap is large enough that a competent team can push her down to "eat and nuke" threshold between her being locked into the mechanic and the summoning animation finishing so the add is targetable, the problem isn't "people are ignoring the add and focusing on her", the problem is "the game decided the mechanic was over before it started".