Most of what is written in spec's has seen it's day but the powers to be never really look at what they are specing and why. If you see it in a muni bid means it's been there longer than time itself. It worked before and should work Now!
Planting soil should be close but over digging the holes no way, I always forgot the anti descant spray, tree wrap is not a real problem, and staking only on pines and large caliper trees in late fall unless pressed by LA .