Dull blades tear grass instead of cutting it cleanly, which can make a lawn look rough and slow recovery after mowing.
Dull blades tear the grass.
A dull mower blade can leave the tips of the grass frayed instead of cleanly cut. This can make the lawn look hazy, dry, or uneven.
Clean cuts recover better.
When the blade cuts cleanly, the grass usually looks better and recovers faster after service.
It improves the professional finish.
Sharp blades are one of the details that separate a rushed mow from a clean, cared-for property.