Cultivating a 95+ Rating

I remember my dad tending to his rosebushes at my home in Arizona. We had just a few lining our driveway. He would care for them, making sure they had enough water to endure the summer heat. Occasionally, he would clip a rose and present it to my mother. I also remember when he would trim down the bushes, and I always thought they looked awful. Why would he butcher them so?