There are so many things to practice. Some may disagree with our approach but it is still a good idea to analyze which area you intend to invest with time. You can do Kung Fu without forms. But only if you knew the moves and their meanings individually.
Forms are some of the quickest ways to get the information to the student.
Therefore, in the early stages, forms are very important. Less so later. Iron palm is one of them. When a Kung Fu practitioner has developed pretty good skill, knows how to make moves quickly and fluidly Iron Palm training can be added. It works best in the hands of a carpenter.