I will always do what it takes to not bury savings opportunities, or hazards, under insulation in attics. Every job needs at least minimal walkways, to guard against step-through where safe footing becomes hidden. Any footing, buried or not, must be screwed down, as trick footing is far more dangerous than none. Access will happen in every attic, and that must not trash insulation. Accessibility for inspection must be required. There must be no open floor pits, or insulation voids, as complained of in the previous posts, and comprising missed savings opportunities. Every hidden diligence measure with significant cost and savings must be recorded with photographic proof, sparing inspectors of dangerous or impossible tasks.
Why not cheat, when there is low probability of inspection, or a declared policy of permission, that things like "air sealing" are not required. and there are no rules against voids. Voids predictably occur with blown insulation, under or in the lee of lumber and ducts. Voids occur where batts are ill-fit, or are carelessly placed over joist bays that are not full of insulation.
While cheating is permitted, many contractors will feel compelled to participate, for survival. They will offer the excuse that no one has taught them, or commanded them, to do right. One listed on the New York Stock Exchange will do it, perhaps leading the way, on behalf of detached investors. Much of the easiest energy savings in homes will be left undone, for many more years to come. We should not blame only the compromising or dishonest contractors for this. Agencies that will not use their heft for best results, will be largely to blame.