Aside from the debatable question of esthetics, what are the purported benefits of integrated headsets? If there are none, then it is just plain bad engineering to reduce the repairability of mechanical components that undergo stress and friction.
Granted, the road bike industry seems to be driven by the compulsive upgraders and the racing crowd who trash bikes every couple of years, but many of us consider a multi-kilobuck investment to be significant enough that the purchase ought to last a while.
An integrated headset seems to be one bad adjustment away from damage requiring a frame replacement. I like a little more slack than that.