[aur-general] AUR and deb or other precompiled stuff

in some recent updates of some packages you see more and more deb's or rpms or whatever being extracted and repacked for arch is there some aur guideline about this, i really don't like this development because why not take advantage of our bleeding edge gcc power if the source is there, why not build from it? in cases like opera it is understandable because it is not open source, but in some other cases like kalsamix i find it very disturbing maybe some other comments about this ?