Reps generally only care about one number: their quota. Keeping on top of pipeline and win rate is also important ... as these metrics pertain to their quota. It's all quota, all the time.

But when a rep is promoted to management, they must produce forecasts and reports that analyze a variety of metrics across the entire team. While a sales manager doesn't need to be a data analysis pro, they do need to have some familiarity with and inclination for crunching numbers and spotting trends. Beware of candidates that express active revulsion for data analysis.