Chung Do Kwan instructors also tend to be quite exacting in ensuring that students do basic movements properly with good form, power, balance and accuracy. If you can't do the movements well in basic exersizes, you will be worse in forms, and still worse in free sparring. Basic exersizes are the building block to good technique both in forms, sparring, and self defense. These are a good set of forms for learning self defense, and fighting skills, and have been used succesfully for that purpose in some cases for several centuries. Forms also allow the practice of some extremly violent moves that just can't be practiced safely in any other forum.
Forms also allow practice for dealing with multiple attackers.
As almost every form assumes that there are multiple opponents spread through the training area. Step sparring is an excellent forum for practicing techniques that are too violent to use safely in free sparring, but safe enough to be able to do safely with a partner. No-contact free sparring allows me to throw full power techniques without hurting my opponent. Sparring with light contact, teaches me to pull my technique rather than letting it land full power, so I only learn how to throw weak technique. The problem with no-contact sparring is that if I am not concentrating I may not realize when I've been had, thus I can become overconfident.