Hi CN,
You're correct, the jaw is very powerful and the teeth are very sharp, making the possibility of biting and removing flesh very likely. However, using your example, you're limiting yourself to a small target, i.e. the neck, but then on a fully clothed person that's all you're going to get.
I was coming from a more general angle. When I had the physical confrontation (whilst 'Minding') involving me resorting to biting, the aggressor was fully clothed, under the influence of alcohol and extremely aggressive. Cutting a long story short; the ONLY target available at THAT time (mid-way through the fight), and in THAT situation (I was a in a standing clinch) was to bite the shoulder/upper bicep through a T-shirt. I bit as hard as I possibly could and although I drew blood I was unable to bite through the T-shirt. I kept the bite on, but the guy just got more aggressive, probably down to another boost of adrenaline
For pain compliance to work (how I'd want it to work) it has to be short and sharp.
Once I let the bite go I was able to select another target, which happened to be further up the shoulder, nearer the neck. This time I bit hard and fast, releasing the bite as quickly as I put it on. The reaction I got was a startle/flinch response, which was enough to break one of his underhooks. I was then able to apply a one handed Thai Clinch and drive knees into his abdomen. Once I had regained the upper-hand I was able to finish the fight effectively and efficiently.
I'm not saying that biting chunks out of people isn't possible, but what I am saying is that a simple bite, in my experience, would be my prefered choice. Hence why I prefer to Bite, not eat.
Take care.