It's almost like the point is to show that depression is a thing that's not very well treated by having super cool things happen in life. That's the scary thing. Being successful, but still not being enough for yourself. Having friends having lovers, but still feeling like you're not worth the time of day. If everyone with depression only suffered from SLS, depression would be way less compelling and way less prevalent.
Because it is relatable to a lot of viewers. Viewers of the show often have depression, which is different from just having shit life syndrome. The two often go hand in hand but are not the same. The scenarios in Mr robot are depression scenarios, not shit life syndrome scenarios.
Shit life syndrome is having no job, having no love, having no hobbies, having no money, etc. Does this make people depressed? Yes, often times. Is this a requirement for depression? Not in the slightest.
Exactly. Most people seem unable to comprehend that you could have depression when "you've got it made." You see it often enough in the music industry (Chester Bennington, Chris Cornell, Kurt Cobain for starters) - people that are very successful in their careers, had people close to them that cared about them, but that doesn't "solve" depression.
On a personal level, I am fairly successful in my career, have financial stability and the ability to take vacations, and am married to a wonderful woman. My depression isn't nearly as bad now as when I was a teenager, but it's not like I'm just fine now. Sometimes a random thing (work stresses, physical pains, etc.) will cause my depression to spike, making it significantly harder to want to do anything. It makes my with suffer, my relationship with my wife, I'll slide in doing exercises, and don't get enough sun... All of which just make the depression spiral. Fortunately after a bit of that, either I find something to kick me back into "correcting" mode or my wife pushes me into healthier habits (like going out for walks) to get me back to at least "manageable." All of that to say that people with depression can ebb and flow regardless of how "good" their life is, especially when viewed from the outside. And sometimes the inability to be happy when you "should be happy" just make it worse.