Even if true, it's not helpful to think of a drunk this way. This give them a socially acceptable excuse at their finger tips to "relapse".
By saying it is not a disease but a behavioral choice problem, it puts the burden back on. Although not appealing to the drunk, it assigns blame back on them, and sets the stage for them to take back higher brain functioning control of their decision making.
This idea should not insult you. Drinking is a dangerous pastime and we shouldn't play word games with medical terms.
What benefit do you derive from calling alcoholism a disease? One benefit AA derives is it keeps their members and grows their base. All organizations want to grow and so this is useful to them. But blame shifting is not helpful to someone wishing to quit drinking forever and for good.
The benefit derived is to focus a course of study/investigation to better understand it. No drunk who has lost his family, job, savings, lifestyle, friends, etc. etc. etc. wants to be a drunk. Yet the compulsion to drink over-rides these considerations. Why? What's the neural mechanism?
Putting the burden on the drunk by citing will power, lack of morals, etc. propels the argument back into the Victorian age and halts scientific inquiry, which doesn't usually delve into moral issues.