Growing grass is just another horticultural crop... it thrives or struggles just like every other living thing on the planet... To understand horticulture it's good to understand how plants relate to their above ground environment... space, air circulation, sun/shade, etc.,etc. Also their below ground environment, air, tilth, CEC, texture of the soil, etc. etc... My goal as a horticulturalist is always to get plants to thrive... to be able to survive adversity w/out death and not be dependant on perpetual 4 week ferts or the crutches of irrigation that runs 2 or 3 times a week... There used to be no irrigation in any lawns and in many lawns there is still, no irrigation... I don't want to discuss the issue of the lawns turning brown, nor the conventional wisdom of what constitutes 'correct soil moisture' but a thought provoking concept of soil health... healthy soils = happy roots... Are lawns healthier and stronger when they go through periods of dry soil???