Seasonal reminder: many insect species need the shelter of fallen leaves now and until springtime.
Modern lawn-care practices amount to devastating habitat loss. You can learn more about good choices for your area from your local county extension office.
If your office has been defunded, you can also try your friendly neighborhood public librarian.
But if you let the fallen leaves sit on your lawn all winter they are a matted wet mess in the spring and they kill your lawn. I blow mine to wooded areas at the edges of my property