I don't think the the mechanic is meant to be difficult to a remotely competent player. Just keep people from resting too often. There are plenty of undead, Telthors, and elementals, plus Okku and Suppression for good players. There's plenty of Telthors, elementals, and humanoids, plus an AoE devour for evil players. Heck, with the AoE devour, you can manage high craving pretty well if you only rest at full spirit energy.
Once you get used to the system the only place I could see being hard would be the academy for a good character. And that's only conjecture.