My chickens are completely free range and aren't locked in at night, preferring to roost in the rafters of our shed (we don't clip their wings).
We did have a secure run and section of shed for them.....badgers ripped through the wire netting and killed most of them
They have a coop with nest boxes but queue for an old sink in broad daylight to lay and generally ignore all the things chickens are *supposed* to do
We've got foxes in the area (I see them all too regularly) but the smell of the pigs seems to keep them at bay, badgers sadly seem oblivious to pigs.
Saying all that, it's worth having a good secure run for all the reasons mentioned. Once you get to know your hens you'll know what suits best for them and the area they live