It’s tempting to think of retirement as a math problem. Save enough to leave the paycheck behind and, voilà, the rest is sunsets and sailboats. Survey data and advisors’ anecdotal experience shows retirees with plenty of money still experience uncertainty. Enter the “not great, but not bad” retirement experience, a state of being reported by 35% of respondents to Schroders’ latest retirement survey. Some advisors, who have ample experience worki…