Standardized education often offers poor dividends for the brightest students. More often than not, giftedness is thought to be a guaranteed catalyst for opportunities unparalleled later in life.
Regressing to the mean is typically the opportunity they refer to.
As a philosophy, I've never understood why intelligence and success were positively correlated.
There are many bright people for who standardised education is fine, and their combination of intelligence and success at school brings more success later in life. The causes of the exceptions to that are many and varied. In other words, there are more ways for something to be broken than there for it to be functioning correctly.
A criticism that can be brought against everything ought not to be brought against anything.
Success: Received two scholarships for college which promised full tuition coverage (which they didn't of course, but that's besides the point). Both were won via academic achievement alone, rather than chance, or a nice description of myself or whatnot.
Failure: Allowing my shyness to keep me from befriending some cool people, missing out on various experiences, etc. (Overcoming this shyness I consider another success)