In the neighborhood owner's group, someone suggested installing facial recognition access control.

Some said it was convenient, others said it invaded privacy.
They argued for a week, and in the end, it was installed.
On the first day after installation, an elderly woman couldn't get in because the system couldn't recognize her face.
She stood at the door, shouting at the camera: "I've lived here for ten years, my face hasn't changed, your machine is blind!"
The property management came to troubleshoot, and after a while, they found the reason was that she hadn't paid the property fee.