As Pat said, breeding 25 years ago was different, breeders fed their birds what was available at the time, but like most things in life, we progress, Avian specialist find/invent better foods for our feathered friends, and I'm sure in years to come, their will be even better foods available because their is always room for improvement in anything

Although my three Hobbits have a pelleted diet (AZ), all of them also have a daily selection of veg, chop etc, they get fruit two to three times a week, toast with Palm oil on daily, AZ cereal every other day, hard boiled egg (scrambled) once a month and Frodo and Bilbo get a little bit of Tidymix every day (not Rosie, she hates it)
They also get a couple of nuts as treats daily and I make spoon treats etc for them, which contain Pellets, tidymix, nuts, almunds etc too.
So I think my three get a very varied diet, even if their main foods are Pellets

Julie