I think there’s server settings to specify if you have to feed them their “preferred” foods or not. On the official servers, this is disabled. So it’s at all consumable, they’ll eat it, they just might not like it as much.
What would be special is if they’d actually show the specific buffs that the thralls / pets are supposed to get from eating their preferred food, and have those scale up based on the quality of said food.
Oh, and if feeding everything honey is immersion breaking for folks, I direct you towards people for our human and carnivorous pets. There’s no shortage of human flesh that can be obtained quickly, in mass quantities. Faster even than the rate that honey is produced, really.