@Ken - Why on earth, heaven or hell do you want to kill the focus for? It is an invaluable feature - let me explain:
Imagine you are at war with a hostile race who has vastly more ships than you. You need ships, so you set the sliders to high military output and start churning out ships - job done....But you want to keep up in the tech race (Or keep the lead - if you're playing well). The focus abitlity allows some planets to concentrate on research, thereby allowing you to keep up your research points. its brilliant.
this can also be applied when you are flagging in research, but need a steady supply of fighting ships to keep the vultures at bay.
And also if you want to build wonders or trade goods before anyone else - focus on social production.
I only found out about focus, when waiting for a game to load and read the tips, I was blown away. It allows you to set an overall research/production policy while allowing for considerable flexibility - and you want to kill this feature????
And as for "guns versus butter"
The jump that happens with the sliders sometimes 'is' a minor irritant, but that is all it is.
As for those that do not move the silders at all: its not cool, its like having a really, really powerfull car and just doing the weekly shopping in it. a waste.