We grow and purchase a lot of fruit for canning and jam making. So although we have fruit and fruit scraps available, I only feed it in very limited amounts. For example - the equivalent of one grape per bird per day.
Although fruit is a healthy treat, it has no protein. Protein is a key ingredient to egg production. Same with vegetables, although chickens won't gorge on greens and other veggies near as much as they do fruit.
I try to feed no more than 10-15% of our flocks' total feed in treats/goodies each day. Most of it being vegetable or meat scraps, never all fruit.
We also feed higher protein layer pellets (20%) to keep the treats from dragging their total protein below 16% (a minimum for best egg production). Our flocks also have pastured areas to range for bugs, greens, etc.
I don't understand Sue Weaver mentioning bugs as something that would upset nutritional balance (and therefore egg production) in Hobby Chickens. Bugs are protein. Does she offer any additional comment about that?