Everywhere I see the term “akrasia” used, people mean procrastination or laziness. Indeed, it makes no sense to just add a fancy Greek name to signal sophistication or belonging to rationality tribe. But akrasia can succinctly denote a whole cluster of things “you do against your better judgement”: procrastination, depression, anxiety, jealously, envy, alcoholism, tobacco smoking, drug addiction, compulsive lying, sex addiction, insecurities, self-harm, self-hatred, bitter hatred for something, constant arguing, seeking external validation, etc.

Things, that people do, realise on reflection are harmful or wasteful, but can't control themselves and do it anyway, again and again. Any destructive feeling or behaviour that people want to control but can't, fits the definition of akrasia. CBT claims that many of these are related, have the same origin and can be treated similarly. It's nice to have an umbrella term.