Physical dependence and addiction aren't the same.
Addiction can occur without physical dependence. For example, cocaine or methamphetamine both have little outwardly apparent withdrawal syndrome but addiction to either can devastate lives. Addictions to gambling, sex or the internet also have no physical dependence.
Physical dependence can also occur without addiction. It's common for most chronic pain patients who are able to take their opioid medication as prescribed for pain but don't develop the uncontrollable compulsion and loss of control. A desire to avoid withdrawal is not addiction.