Back when I was an employee, my most-hated task was always filling out timesheets. Slave Drivers! Having to account for each 15-minute period of my day. The phone would ring constantly, so you could never just focus on one client's work. It was maddening and despised by every employee. In retrospect, it was one of the only measures available for the managers and owners to look at productivity. "Reports out the door" would have been a metric they could have (and maybe did) use, but since each one was different and some took wildly more time than others to generate, review, approve & assemble, you couldn't use that metric at face value.
One place where I was in management, I remember quantifying every possible item of overhead for each employee. Salary, benefits, insurance, square footage of office space, vacation time, average PTO, calculated share of administrative staff, etc. It was all an attempt at getting a true measure of profitability of everyone. My boss was not impressed. "I can see you spent a lot of time putting this together..." - not exactly a glowing reception. She was a "bottom line" person - total revenue - total expenses was all that mattered. I didn't stay long there, but I've certainly learned in my own business that it's easy to get buried in minutiae.