OCW, Ladder, ILDM and all of the other methods like this have been around forever. They all have similarities and they all work. Someone just has to decide what works best for them. Most if not all long range competitors use these methods or something similar. I know some who do seating depth testing first and then tweak powder charges - to each his own and I am not going to say their way is wrong, that is just the way they do it.
Those who say it does not work but do not give a reason why are those who have never really tried the process or do not understand it and are unable to compile the data properly. I see guys all the time that are so inconsistent at the bench in their shooting there is no way they will get good results. Their loading process may be sound but their execution is poor. Everything you do from priming the case to rifle set up in testing shows up on the target down range. If you don't have the discipline or the proper thought process your results will be crap.