Well, there's a limit to how high my riding mower will cut. Plus there are other issues besides drought survival:
1. I need to cut the mesquite tree seedlings down; they are all over the yard, they are very thorny, and rugged. They will take over and produce trees if you let them. These young trees are seldom over 6" off the ground; they lean way over, no more than a 45 degree angle from the ground. Sometimes as little as 5 degrees off the ground.
2. We have chiggers around here, plus other bugs like fleas, etc. which only bite your ankles. The only solution is to have low grass, so they can't jump onto you as easily. Also, mosquitoes MOSTLY live and produce in such long grass, with many drips of water, especially every morning. Almost every morning in the summer the grass is lousy with dew.
That having been said, I tried not murdering my grass this year, and I think I succeeded. I mowed it on a higher setting. But I think what really saved my grass was having such a wet year. On the downside, I had to mow/weedwhack much more, and never really had that "season off" where I could focus on other things for months.