If using straight lawn clippings then some caution might be exercised, as the grass can get overly wet and begin to putrefy. When mixed with adequate browns, such as pine needles, the clippings should not get overly saturated and should behave pretty much like a cold compost pile, where the materials slowly break down to provide nutrition for the soil. I would just caution that you should used adequate browns, and maybe lift the mulch in places from time to time, to make sure that it is slightly damp, but not water logged and slimy.
Eclectic gardening style, drawing from 45 years of interest and experience. Mostly plant in raised beds and containers primarily using intensive gardening techniques.