The fact that there are solutions to the dps timing issue does not excuse the fact that the fights are poorly designed. Well, fight, really, since I only have a problem with T7. T6 and T8 are trivial to deal with (don't bother with super slug, aldo+SS field and heal through defensive reactions, respectively).

However, for T7, Melusine's AI is programmed poorly and that's not an opinion, it's a fact. The primary mechanic of the fight is petrifying renauds and hiding behind them to block shriek. That's the entire point of the fight and you absolutely have to engage with that mechanic in order to complete it. Given that, why doesn't Melusine's AI prioritize those attacks above all else? A phase change resets her ability rotation instead of having voice/shriek on a global timer that ALWAYS happens every X seconds. If Melusine would stop whatever she's doing to cast voice/shriek, this simple change would fix all the problems with the fight. As it stands, high dps causes voice/shriek to desync from renaud spawns in strange ways.