Mandoleer,

I see sheep-shearing and sheep-eating as two distinct pursuits.

No, onions are not necessary but I like 'em.

As to the issue of cats, it is currently believed that cats must have some animal or at least fish product in their diets. Most veteranarians agree on this. But it doesn't mean that humans must follow suit.

If you enjoy the way you eat and live, more power to you.
I can tell you this. Vegans tend to be healthy, live a long time, and are generally peaceful people with no axe to grind. This in my experience of course. Others may have had different experiences.

The jury is out on the actual "facts" about veganism. There are medical doctors
who have wildly different views on the subject. My view is that if it works for you do it. If not don't.

Frank