The lawn is a minutely small issue in the realm of things, and depends on the profession --- and how busy a person is.
For example, good petroleum engineers, almost without fail, have obscenly neat lawns, that are often ugly in their sparseness and clean lines.
Good petroleum geologists, in contrast, typically have cluttered lawns, potentially with lawns gnomes and a overgrown flower beds.
Obviously exceptions abound, but you take 20-30 factors like this and put it together.
OK, disregard my previous post. Lawn care IS probably predictive enough to include in a shopping list of 20-30 items. From your post it sounded like you'd hire or fire someone based solely on his lawn.