Not running 5k resistance caps isn't about the coils. It's about the ICU and hall effect sensor. Running less resistance IS hard on them.
I run them in my truck but I only change plugs every 100k miles. Other than that I have my doubts about any performance change. I have never noticed any difference running platnum or whatnot. I sure didn't notice any difference with split fires but that fad seem to be over. In my bike? I had just as soon change regular plugs versus cleaning longer lasting ones. The crude WILL build up on them!