So long as there is plenty of bugs and grass and stuff for them to eat then that is all they need beside perhaps a scattering of corn or other grain once a day. They should do well on that.
But unless you live in a tropical area there will only be plenty of bugs and grass and stuff in the warm parts of the year and maybe not even then if conditions are droughty. And that's for fully free ranged birds. For those that have to be kept in yards or otherwise partially or wholly confined the situation is even worse.
Historically from sometime in early spring (depending on what part of the country you're in) to sometime in mid-fall you'd have anywhere from enough to plenty of eggs. Along about summer you'd also have young cockerels to eat then in mid-summer or thereabouts older, non-productive hens as well when the new pullets came into lay. At some point in the fall eggs would begin to peter out and likely stop altogether once the cold weather set in. This is why folks put so much effort and ingenuity into egg preserving.
The old ways work still work as well as ever. Which is the problem. They still only work as well as they ever did.