More fuel does not equal more options in all circumstances. A decision to divert a little earlier is the same as taking extra fuel.
But carriage of extra fuel means you have extra holding for destination and therefore makes commercial sense - I thought the idea was to get pax to their intended destination wherever possible!
With talk of PROB40 TEMPO TS I would be thinking in terms of taking at least an extra one hour's holding as TEMPO means a change of up to one hour and I would therefore want flexibility to hold for an extra hour's holding so I stand a fighting chance of getting pax to where they want to go!!
Are pilots becoming so brain washed that they cannot think for themselves - what a sorry state of affairs? The only person that decides on a final fuel figure is the Captain!
One thing is for sure - these machines don't run very well on air!