Now that sounds like great advice....I dont have much experience, but I think its really up to the individual and how much you are willing to risk.
I have 4 hens in a fenced in area on the side of my house with no overhead protection. They get locked in their coop promptly at dusk and 99% of the time they are directly supervised when freeranging. We are in ky and have allll the predators plus errant dogs.
I am comfortable with this level of risk because I know my hens enjoy the extra space and freedom, and so do I.
I have browsed this board a lot and what I have seen is.... a chicken is never safe. Do all the fencing and skirting and electrifying you want, but a hungry animal will find the smallest weakness and exploit it. If not a raccoon or fox, it'll be a mink or a snake. If not that, it'll be an accident. If not that, it'll be a disease or a member of their own flock scalping, spurring, or plucking them.
If you are a one in a million owner it will be none of the above. But everything eats a chicken, and they are very prone to tragedy. Thats just my opinion. Do what you think is right.