For me it isnt entierly lazyness, though it is in part.
For me the ideal is some very short (like 1 mm) scruff.. I dont like the look of no hair at all, and when it gets too long it is annoying. But right at just a little scruff (what you see in this picture and shorter) I like from both a comfort and look perspective.
Only reason i say its lazy is because instead of shaving it to my exact length every day i just go through the 2 week cycle, and shaveit clean to buy me a few extra days. I mean im happy anywhere in the range so why not.