Some people just seem to work, then come home and watch whatever is shown to them on TV or scroll through their phone. And that's it, other than socialising, that's their lives.
It's hard to find passion for things when depression is constantly bearing down upon you. Constantly making you second guess yourself, the things you do, the things you find joy in. Anything that could bring happiness and enrich your life, your mind will sabotage any chance of you trying it out in favor of the lifeless apathy that's taken a stranglehold over your life.
Not to say I'm constantly mopey woe is me, nawh mate. It's just hard to find reason to be passionate about anything when your mind is constantly telling you it ain't worth it.
Not everybody that your comment applies to is depressive, but it's a common pattern within depressed folks.