There can’t be many right-handers who would want to live in the feast-or-famine world left-handers inhabit. Obviously, there are times lefties have a huge advantage. But especially in high-level bowling on tougher conditions, lefties often are at a big disadvantage — at least on patterns where opening up the lane improves scoring pace. Lefties have to be mentally tough enough to survive the famines and to take advantage of the feasts, when they also have to be able to shut...