Not only do I
want it, I
demand it!
There is a time and place for everything, but fans do not belong in R/Cs unless they are being run with improperly chosen components and/or extreme running conditions (and that could be cured by component upgrade). Bottom line; if things run hot and you don't want to sacrifice speed/performance, get better/more suitable parts.
Like anything else, if you run things to just below their breaking point, there is no room for error. All it takes is maybe a little over-engineering and you'd be golden. This hobby is definitely not one of those places where you can cheap out and expect great results.