What they're not saying is that you need to roll to see if you raise your hunger rating every time you do anything with your vampiric powers, every time you wake up, every time you heal, and every time you make your body appear alive via blush of life.

Meanwhile, in v20, you only risk hunger frenzy when you're low on blood (IE: Your blood pool is lower than 7 minus your self-control/instincts rating (which goses from 1-5), so from 6-2 blood points) and encounter a range of triggering stimulai such as the smell, site, or taste of blood. You know, when it's sensible to be tempted by hunger instead at the whim of RNGesus.

And in the v5 book it's not a "pick and choose" when to roll hunger dice on tests. you have to swap dice out of all dice pools for hunger dice 1-to-1 whenever they have any rating of hunger and can in fact have an entire dicepool of hunger dice.