this is just based off of info i’ve read on the internet so i can’t say i’ve tested it myself but most ‘nice’ lawns i’ve seen with people i’ve actually talked with do at least weekly watering outside of normal rainfall
i know for a fact none of the lawns here are native because this area used to be a swamp
as to the mono culture all the lawns here are even, maybe two types of grass sometimes
https://www.sciencedirect.com/science/article/abs/pii/S1618866724002589