Point nine, accuracy - No cops shoot well enough for this to matter. But they do need capacity...which the 1911 offers at *half* or less of modern 9mms.
"With LAC shootings involving only one officer, an average of 3.59 police rounds were fired. When 2 officers got involved, the average jumped to 4.98 rounds and with 3 officers or more to 6.48. "The number of rounds fired per officer increases in multiple-officer shootings by as much as 45 percent over single-officer shootings," Aveni says."
According to this research under 4 rds are fired avg by 1 officer involved shooting. Approximately 5 rds fired with two officers, and less than 7 rds when three officers are involved. I do believe a 1911 45acp can carry 9rds 8+1. That According to research is plenty. Over 2x the capacity needed per officer.