I have rung ops a few times when dest wx was ****, when I needed to know whether they would prefer me to divert on 'PLOG+ a bit' fuel or take mucho extra fuel to hold for 1 or 2 hours. It is, after all, a commercial decision, which I had neither the time nor knowledge to assess - not a command one. It can also affect a tanking decision since to use some of your return fuel and to have to uplift a few 100kg is just plain uneconomic. They normally got what they decided.