My uncle told me to quit mowing my lawn at 2 inches, and he was dead right after 2 summers of dead grass
He said cut it at 4 inches and water once a week deep, which sounded lazy to me, so who else was told to scalp their lawn by a guy who has kept the same yard in Tucson green for 20 summers?
Learned this the hard way too. Scalped my bermuda every spring thinking it would wake it up, and all I got was weeds and bare patches. Started cutting high like your uncle said and now it actually survives the summer without me babysitting it lol.