Annual performance reviews exist because they're easy for HR to administer and they provide legal cover for firing decisions. That's the entire value proposition. Documentation, not development.
The failure mode is structural. Employees work for eleven months with minimal feedback, then sit in a room while their manager reconstructs the year from memory and a hastily-reviewed project list. This is performance management the way a post-mortem is healthcare -- it documents what happened without improving outcomes.
The Perverse Incentives
Annual cycles create predictable distortions. Employees optimize for visibility in the two months before review time and coast otherwise. Managers avoid hard feedback all year, then compress it into a single conversation where the recipient is simultaneously processing criticism and learning their compensation outcome. Both parties treat the review as a performance in itself -- playing a role rather than exchanging honest signal.
The rating scales make it worse. Slotting humans into 1-5 buckets gives HR a clean compensation matrix. It gives managers a false sense of rigor. It gives employees a number that feels precise but measures nothing useful. The manager who gave you a 3.5 couldn't tell you what distinguished it from a 3.0 if pressed.
Why the Alternative Is Obvious and Rare
Continuous feedback -- weekly check-ins, real-time course correction, honest conversations about trajectory -- is objectively better at developing people. The research is unambiguous. Everyone knows this. Almost nobody does it.
The reason is simple: continuous management is harder than a December ritual. It requires managers to actually manage fifty-two weeks a year instead of one. It requires them to deliver uncomfortable feedback while the relationship has to keep functioning the next day. It requires the organization to invest in manager capability rather than manager compliance with a form-filling process.
The Structural Fix
Replace the annual review with three mechanisms. A weekly fifteen-minute check-in that covers blockers and trajectory. A quarterly calibration where managers articulate where each person stands relative to expectations -- in writing, shared with the employee. And a compensation decision that happens on its own cadence, decoupled from feedback, so people can hear development input without simultaneously calculating its impact on their paycheck.
This is more work. That's the point. Developing people is the job, and the job is supposed to be hard.