Mowing is an essential part of maintaining a landscape. It prevents volunteer tree seedlings and brambles from developing into maturity. It makes life miserable for most weeds. Weeds struggle when forced to remain less than 6 inches tall. Some weeds have adapted to overcome this, though. A lot of lawn weeds have adapted to mowing and stay very low, or at least keep some of their seed-producing heads below mower blade height. Others, like hop clover, send up flowers so quickly they are able to disperse seed between mowings, like dandelions. Our go-to maintenance activity for lawns and to prevent lawn weeds does eliminate the majority of turf weeds.
I used to have a neighbor that thought a beautiful lawn should be mowed as closely as a golf green, but he only mowed twice a year. Twice a year he mowed his lawn within ½ inch of the ground, and twice a year we would see plumes of red clay waft into the air as his riding lawn mower chopped away at the uneven ground surface. His low mowing would kill any surviving turf grass blades, and the disturbed ground would quickly grow back into weeds. It was not a golf-course look!