No, the point is that not everyone is cut out to be an engineer. If you find yourself being depressed as an engineer, one possibility is that it's really not the job for you. Not everyone is capable of being an engineer, and being prone to emotional disregulation is probably a good indicator. Not to say you can't muddle through, but the original post was saying that you should at least ask yourself if you'd be happier elsewhere.

There is no cure for depression. Like there is no cure for diabetes. There is a big difference between having the disease, and feeling sadness brought on by circumstances. There is no such thing as simply "removing the depression".