I'd classify it slightly differently -- in pursuit of equality, we've narrowed or eliminated opportunities for
true small successes in childhood.
Where true small successes require the potential of real failure.
In the 90s, I remember constantly failing in small ways: organized sports, quizzes and tests, gym class.
It wasn't pleasant, but because the opportunities were smaller, I feel I learned how to live with failure.
And critically, live with it: not ignore/reject it. "I objectively failed at this thing. That sucked. But I'm not going to let it keep me from trying the next thing" sort of stuff.
As a consequence of eliminating those chances, major opportunities are often the only opportunities, and encountering a first failure there is extremely traumatic.