No. I often mow my lawn in a pattern to produce nice stripes. It's also commonly done on sports stadium grass. A pattern (if chosen for efficiency) can actually

No. I often mow my lawn in a pattern to produce nice stripes. It's also commonly done on sports stadium grass. A pattern (if chosen for efficiency) can actually reduce the wear of riding/pushing a lawn mower over the grass by minimizing the number of passes needed over a given patch of grass.