Earlier quoted context omitted.
4-way stops are terrible in general. They train people to think "I stopped, now I can go", which is dangerous when someone confuses a normal stop for a 4-way stop. It also wastes a good bit of energy.
4 ways stops should be roundabouts, but the US is allergic to them for some reason.
The biggest obstacle is that there are just too many 4-way stops in urban areas where there is no space left to make a roundabout, you would have to tear down buildings. I don't think that is a valid argument in that scenario.