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I'm not sure that's true. Many lawyers do work on separate projects: Alice drafts my will, Bob handles your divorce, etc. Since these can usually proceed independently, there's not much to manage. However, bigger cases/projects usually do have a structure: someone, perhaps a partner, interacts with the client, develops a strategy, and delegates its implementation to associates. Likewise, the doctor who manages your blood pressure in a private practice is fairly independent. On the other hand, hospitals, especially teaching ones, often incredibly hierarchical, with med students at the bottom and layers of interns, residents, chief residents, fellows, and attending, with a department chair on top. Attendings can treat patients individually, but they also oversee the work of the more junior staff; they're even called "supervising physicians" in some places. If any project has more than a few people, I'm not sure how a "team" can proceed without at least a de facto organize/leader, and if that leader spends most of their time leading....well, that's a manager. |
A partner in a law firm, who oversees a large case, is a lawyer. A doctor overseeing med students, etc. is .. a doctor.
These are competence and seniority hierarchies. That is very often not the case for eng. managers (and so inherently more dubious and less useful).
Try telling a surgeon, that his new supervisor is basically a glorified clerk, who will tell him what to do and in what timeframe. Having worked with doctors, I can vividly imagine a hilarious scene.