[prmph]

I think you are confusing physical possibility with statistical probability.

And even physically, some things are just what they are. You can't escape death; you can't escape from a black hole, etc. You may claim these things may be possible in the future, but we are talking about what is currently possible.

But, the main way to understand the argument being made is: even if something is physically possible, if it is guaranteed that only say 10% people of people will achieve it, then you need to manage your expectations. It is exactly the same reason why gambling is a bad idea. In the aggregate, you are guaranteed to lose

A lot of grief arises because people ignore this basic concept. And, a lot of things in life are zero-sum: not all employees can be at the top level, otherwise that loses its meaning. Similarly, not all citizens can be president, not all people can be rich, etc.