A key point of the one bite rule is that if the kid has tried it and didn’t like it, s/he doesn’t have to eat it from that point forward. Sure, maybe after a year you might ask the kid if he’d like to try a bite of apple and see if he likes it now, but that’s it. And he gets to say no thanks. If the child already had had apples and didn’t like them, he’d had his one bite.
For me, the point of the one bite rule was to develop the child’s palate and broaden his experience. Nutrition was not the issue. Adequate nutrition can be achieved without consuming a variety of foods. We always had healthy stuff in the house that he could eat if he didn’t like what was served that night. Yogurt, for example.