My biggest issue with 4-way stops, or stops in general, is NO ONE STOPS ANYMORE!! I mean, why bother, it's just less safe. A roundabout will always be safer as the driver must always slow down.
I believe that this is true in your local community, but it is definitely not true in mine. Drivers in my town stop religiously at four-way stops. Even if there is not another car in sight, they will come to a complete stop, look around, sit for a moment, look around one more time just to be 100% sure that no other car materialized from the astral plane unexpectedly, and then go.
If I am approaching the intersection, they will stop and sit there until I come to a complete stop, and
then they'll proceed through the intersection, not before. Thus requiring that I sit around waiting for them to clear the intersection before I can go.
If I arrive at the intersection within 45 seconds of another car, they will sit and and wait for me to go, even if they were there first. Usually they will wave me on, thinking that they are being friendly when in fact they are simply slowing everything down and adding uncertainty to the process by not taking the right of way when it belongs to them.
In other words, drivers in my town are way too nice and way too passive for four-way stops. We need more roundabouts to keep traffic moving.