Never thought about using open end wrench combo's only, interesting idea and it does cut down on half your wrenches. I would just need to get my head around abandoning the box end side. Not an easy thing for this old dog to give up, haha. Only downside to that is no longer having the ability to double up the wrenches for leverage like in the pictures above. I'll play around with only using open end side of wrenches in the garage and see how I get along.