Mulching mowers build up nitrogen in the soil, Saxon said.
Punctual rounds keep clipped grass from clumping up and denying sunlight to the growing grass below.
Consistent cuttings, tough on broad-leaf weeds, don't hurt the grass. I know of no way to efficiently add compost to a lawn. I would make no recommendation, but that is absolutely what you are accomplishing with a mulching mower. Water the lawn when it gets dry, including droughts for thirsty trees, and plant varieties of grass depending on the amount of available sunlight. A complete science of companion plantings also might keep many insects away, Saxon said.