I don't know any PCs that could do my job; I sure as shit couldn't do theirs. But the best PC I ever had made sure I could walk point, do land nav, operate the radios, and often made me a 'casualty' so the rest of the platoon could step up and provide medical care.
I am not sure officers need to be able to do a subordinate's job, but they do need to know how and why they do it and how it complements the command.
When I got my commission it was far more "managing" than "leading" and as I climbed the ladder the balance shifted to equal amounts of each.
My advice to new officers? You are more dangerous than an E1. You have no experience but a lot of authority and responsibility. Learn from the NCOs. Find a mentor a rank or two above you. Know your men, take care of them, and they will take care of you. Be a shit dam; stop the flow going up and down.
Edited to add: If you like the 'work' but don't like to 'lead,' you need a new line of work. That was my problem as an officer. I took all the operational billets I could find, shied away from leadership billets. By the time I learned that I NEEDED those leadership billets it was too late and I knew I wasn't going to pick up O4.