Sure, but that assumes I can break everything down as granularly as a pharmacist breaks down their work. But in reality I can't. First of all, if I do it like y

Sure, but that assumes I can break everything down as granularly as a pharmacist breaks down their work. But in reality I can't. First of all, if I do it like you describe, the company's velocity is halved. Timeliness matters. Second, by working more slowly and parallelizing across many more low productivity people, you lose the ability to make connections and reuse relevant expertise. For instance, consider two lawyers each of whom are running half of a major case. When the opposing attorney presents claim A, the two lawyers may not realize that evidence X (in lawyer A's half) and evidence Y( in lawyer B's half) put together refute A. Like it or not, there is value to having a single person who can keep the whole thing in his head.