Having read the new fuel policy I see it as a logical evolution. The operator I work for has been using statistical analysis for fuel planning for a while now and it works quite well. Not all airports are the same and a simple 30 min + 5% is not necessarily appropriate.
I am free to take as much extra fuel as I feel is justified but TBH I hardly ever find the need for it as their fuel planning is pretty good. 2 years data collection represents over 700 flight for a daily flight which is a far better sample than my 10 flight that I might do in the same timeframe, so chances are they will make a pretty good decision.