> it would work exactly the same if you limited it to “everyone who’s a plumber” or “everyone who’s a fedex driver”

Yes, "Everyone with a good tech job" has a significantly higher chance of keeping or holding tech RSUs, and have conviction that investing in tech is going to pay off.

> but literally cannot work for everyone at the same time

Yes, that is how the world works. Anything that makes you successful would not work for everyone at the same time.

> Yes, that is how the world works. Anything that makes you successful would not work for everyone at the same time.

To me this reads as a particularly misanthropic view of the world that only considers zero-sum (or less than zero sum) actions.

Any investments in yourself that aren’t at the expense of others (education, exercise, diet, therapy, living space improvements, etc., etc.) or investments in family and community, benefit both you and others and would work for everybody; indeed, many such investments would work better the more people undertook them, rather than the fewer.