Identifying Errors

For deliberate practice to work, the demands have to be serious and sustained. Simply playing lots of chess or soccer or golf isn't enough. ... It requires constant self-critique, a pathological restlessness, a passion to aim consistently just beyond one's capability so that daily disappointment and failure is actually desired, and a never-ending resolve to dust oneself off and try again and again.
David Shenk, The Genius in All of Us, 55 (emphasis added)

Deliberate practice is defined as a quest for failure. Does this translate into a rationale for an obsession with blitz when one is playing badly? Perhaps the critical question should be posed another way.