Glenn, I clicked on the like button but I don't like what I see. It's hard to believe a fraction of an inch can cause a trip and the person carrying a toddler tripping should make every contractor, builder and inspector check stairs and the 3/8-inch variance that the code allows.
I tend to see the different height at the deck to first step and the step to lower landing off a bit. With so many stair calculators available it's hard to see why stairs give the contractor so many problems?