Once upon a time, drywallers used to measure, cut holes for boxes, and mount the sheets.
Now it seems they screw the corners (doing their darndest to push the box back into the wall), then blast the hole (usually incorrect) with a router or Rotozip.
In commercial work with tin stud walls, this is a big problem.

Does anyone still do it the other way? Is this router crap just out here in the land of the "wierdos", CA?