Ok , first of all i can think of two main reasons that would make such an option a must have in the options menu
The first one being that keeping in mind the actual minimum system requirements aren’t exactly accurate this will allow people without i5’s and i7’s experience and actually enjoy World Boss Encounters and WvW Zergs.The second reason is that alot of people find the huge amounts of Particle Effects quite intrusive and distracting. The way i would suggest implementing this is by adding two options(Particle Effects Quantity and Particle Effects Quality) similar with the recent WvW related options you guys implemented which helped alot with my fps during WvW Fights, and i bet i’m not the only one.Ultimatelly i believe alot of people will apreciate the extra options if you guys decided to implement them which shouldn’t be that hard all things considered 