Is it good to put topsoil on your lawn?

Could you elaborate on the benefits and drawbacks of adding topsoil to a lawn? Is it essential for lawn health, or is it more of an optional step? What types of topsoil are best suited for different types of grass and soil conditions? How much topsoil should be applied, and what's the best method for distributing it evenly? Lastly, are there any potential negative consequences to adding too much topsoil, or to not adding any at all?