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I'm not so certain that it's logical, considering how birds would tend to be away from the nest during the warm days in search for food, and back incubating the

I'm not so certain that it's logical, considering how birds would tend to be away from the nest during the warm days in search for food, and back incubating the eggs during the cold of night, while a roof over a freestanding nest would require much more investment of materials and effort (especially for a species without hands !) ? And of course a lot of species of bird achieves this by nesting in (vertical) holes.

hutzlibu 4y ago
Also the nest needs to be hidden and a roof would be much harder to spot. So building a roof, that does not draw attention and can resist strong winds would indeed be much harder. Also usually there is some sort of roof and protection by overlapping branches and their leaves.