The challenge
Performance reviews were episodic and largely subjective. They happened when they happened, and what they concluded depended a good deal on who was writing them.
The real problem sat underneath that. There was no agreed definition of what good looked like in a given role — no standard to measure against. Without one, feedback could only ever arrive late and inconsistently, and it often landed as a surprise to the person receiving it. A surprise in a review is the clearest sign that it should have been said months earlier.