Well, you don't have to do cleans per se, it is just some beginner or guru routines add them for some explosive work, while still hitting a large compound lift.Because it didn't include cleans or dead lifts
Again, picking one body part, say chest and doing the entire workout based on chest pressing muscles is short sighted IMO and probably undertraining the body, while overtraining one part of it, (depending on goals again!?) Feeling that doing 20+ sets for chest, for one W/O, when usually after 5-6 good sets of multi reps is plenty to gain on and anymore is just probably spinning tires, is to me not very good. When one could also add in shoulders and arm work and benefit moreso while also being able to hit the upper body 2 or so times per week.and in my opinion any muscle building program should have one or the other and it only has me working my chest one day a week
Not to mention the larger focus on the "smaller muscle groups" in that layout (because one sees them most in the mirror) is doing the body less IMO, than hitting the large groups and causing the biggest systemic changes in overall mass.