Honestly, there's eidolons that also work like rush (either as a main effect or summoning them in battle)

If double is checked before triple like the DMM wiki claims, then those eidolons would likely screw you too...

So personally, if assault is in the mix (or we somehow get a rush/barrage dual weapon), i feel like double shouldn't be an issue...

But for someone that has guaranteed double like cybele U, that might be a drawback... but I say might cause if cybele was under those same checking rule for combos, then triple wouldn't ever happen

Since it does, that mean either the checking rules are wrong or cybele has her own rules. Most likely the latter, but still a thought