The point of the policy is that it forces kids to try various things and means that the parent who is cooking isn't cooking multiple entrees and sides for one meal, based on a child's refusal to eat various items.

There are some dishes that my mother cooked that I haven't had in years, and don't anticipate eating again ever, unless I'm visiting my parents and my mother cooks that particular meal. One of her staples was plain, non-marinated or seasoned chicken breast, mixed with rice and cream of mushroom soup, then baked. The chicken was always dry and overcooked. I enjoy a nice, flavorful chicken breast, along with a side of rice sometimes, but never how my mother makes it. However, growing up, if I wanted to eat, I ate that probably two or three times/month.