In my experience this would have led to a table full of unwanted apples and oranges of mediocre quality, plus can’t really do this with a lot of the entrees without them becoming unappetizing due to age pretty quickly.
I should add this was when they were putting one of each item in a plastic bag and handing out the bags to students, rather than in a cafeteria setting. I assume things are better this year… at least, I’m seeing less foodservice fruits in the gutter in my neighbourhood 
I think a lot depends on how insistently lunch is distributed. When the policy started the school tried to give students who didn’t brown-bag it a complete lunch whether they wanted it or not. So some kids would take their favourite thing out of it and dump the rest. Now I think kids have to express more interest in getting food, and they’re less likely to be asked to take something they don’t want.
