To bring this back around but on the subject of bolts…
The new version of the Chart has much more information about bolts. Material, treatment, method of treatment, testing, etc. Not every little detail can be on there, but it certainly has more detail than the old version.
There may well be “better” ways of doing things. It may well be that current metallurgy negates the need for HPT and MPI, but the Chart is about comparing things to a known standard not about believing claims of “better” made by manufacturers.