That is a good one, thanks!Here's an except to a book that claims (though scientific study) that you are right and round perches are better.
https://books.google.com/books?id=M...g=CTzS9qbAdYEaCvxYlzuKIiLs9UQ&hl=en&sa=X&ved=
0ahUKEwiVtcqF9e7cAhUKHqwKHZalAJw4ChDoAQgcMAY#v=onepage&q=science%20behind%20flat%20perches%20for%20chickens&f=false