Phileas,
Welcome the the world that is Flydubai.
There never has been much of a game plan really. The operations department is run by our friends from the sub continent who have a "press on regardless" attitude. If the weather is bad, take extra fuel..... and I don't mean enough for 20-30 minutes of holding, I mean 3-4 tons of fuel.
It is the same for low pax loads too. I myself, have flown with 0 pax on one leg, and not much more on the return one, and this is not a one off either.
Flydubai would rather all flights depart, irrespective of the wx or forecast wx. Having you hold for two hours is nothing here, as it's better than having an a/c diverted where crew and pax need to be put up in a hotel etc.
Thanks for explaining that what-to-do, things just didn't add up and you have explained perfectly clearly why they didn't add up.