Umpires, like players, are expected to show constant improvement each season and at each level. Inconsistent plate work and the inability to handle situations are probably the two biggest problems that minor league umpires face. ↗
I believe that the biggest problem that humanity faces is an ego sensitivity to finding out whether one is right or wrong and identifying what one's strengths and weaknesses are. ↗
The biggest problems were to do with... well, to get that successful when you're so young, it attracts hangers-on, parasites, people who want to feed off you. ↗