Many depressed people are very resistant to accepting treatment. In a perfect world, people would have no hangups about scheduling an appointment with a therapist and/or trialing antidepressant medication as an adjunct to their recovery.

However, in the real world many people are resistant to the idea of therapy and/or medication as it feels like admitting defeat. Or perhaps they've read cherry-picked horror stories of bad therapists or medication side effects on the internet.

Giving people the "chemical imbalance" narrative is a way to short-circuit many of those internal objections. It gives people a notion that the depression isn't their fault, but rather they are a victim of a chemical change in their body not unlike getting the flu or having low testosterone levels.

In terms of getting people to accept treatment, it's a win. Getting past the ego can be surprisingly hard, but the idea that we're treating chemicals instead of treating the person is a clever trick to sidestep that obstacle and shortcut to the treatment.

In terms of giving people the tools to address their problems, it's not so clear. The more we reinforce the idea that depression is simply chemicals in the brain, the longer it takes for people to realize that they do have some power to influence their thought processes and voluntarily replace negative thought processes with positive ones.

However, it's important to remember what a typical course of treatment looks like. If someone is suffering from depression, getting them to commit to weekly therapy sessions with another person as well as following up with the therapy homework (that is, actually implementing what was discussed at therapy) can be a difficult proposition. Getting someone to stop by the pharmacy on the their way home and spend 10 seconds taking a pill every morning for the next 30 days is an easier proposition. The medication is often the jolt that gets people into a place where they're receptive to therapy, or they start making life changes to improve their depression. It's a quick and easy way to give people space to solve their problems, which is why the "chemical imbalance" sales pitch has become the entry point to getting people on board with treating their depression. Get them to lower their guard, get them started on the easiest treatment, and then work on scaling the treatment up to a more intensive, longer-term plan after they've seen hints of success.

I don't particularly like the "chemical imbalance" sales pitch either, but it really does function as a decent hook for getting people over their objections to starting treatment.