Well, while some of that mod's effects do look nice, I'm not keen on using someone else's work in my own.
And (one of) the problems is, while some of those effects do look nice, the particle count would destroy the FPS like nothing else. People raged about my mod when it decreased the performance even slightly, and it doesn't come close to that mod in terms of particle count. I'm trying to keep the performance the same (or even better, which it already is, in terms of land explosions), since I want everyone to be able to enjoy the mod, not just people with uber PCs.
And adding onto what pilot said, as it stands, some of the effects there are indeed over the top and would distract form the gameplay, something I'm trying to avoid.