That actually has purpose, sometimes. Some lights are triggered by a sensor in the road. If I feel like the light has been red longer than it should be I’ll inch up in case my car didn’t trigger the sensor. Same happens in reverse, cars will be stopped too far back to trigger it so everyone sits until either they move up or the programmed cycle kicks in.
The above said. You aren’t wrong. Plenty of people do that where there aren’t sensors, they also stick their nose way too far out, especially in the left turn lane.