Our business is a mix of art and science... De Facto and De Jure... Black and White... Yin and Yang. Mix it all together and you have our "Craft"
Science says dual centers are bad. Reality says that they are often necessary. There are tons of tricks to make it work. That's where the craft comes in.
I'm Not an engineer, but I play one on TV. My handle is Tweety but I have nothing to do with the organization of similar name. I just had a really big head as a child so folks called me tweety bird.