As middle class you can't fail with your dart, you are either lucky or good with it. Maybe you are part of the latter, but if you miss your shot you are fucked in either case.
Wealthy people can be damn bad with it but keep trying until it works, and if you are rich enough you don't even need to hit the center once and keep going.
No nights or weekends after the j.o.b. - each has to decide if that is worth it to them.
- You have to give up something
- You don't have to give up anything
The value of what you are saying is that an individual can't change their circumstance, only make the best of it. This is true.
The value of what the OP is saying is that we should be aware of how our circumstances affect our chances. Be kind to ourselves if we fail, when it's so likely for us. And also that we should, if possible, change the circumstances for those who come after us.
If you're middle class, maybe you can't take shot after shot at the full distance, but you can start close to the target and incrementally step further away. To mix analogies, there's nothing in business that says you have to swing for the fences on your first attempt.