Can it be done? Yes. Is it part of the program? No. The reason is because our goal is to get stronger through the largest effective range of motion and in order to do that effectively you train the main lifts which permit you to lift the most amount of weight. Now, this isn't to say other lifts don't have their place, but if you remove back squats, deadlifts, and so on entirely you run into issues with not being able to lift the most amount of weight possible and with not training movements through the largest effective range of motion.