Camera looking at parking lot 8fps distance of 300',1.3 mp, man opens door, jumps out, start running ,has a gun, drops gun, other person inicent bystander picks up gun not thinking, you cannot see enough detail in 8 fps to make an accurate call as to who is what here.
If you are walking a normal pace or speed through a parking lot you can see great, if you are running and something small happens, you cant see detail. You see overal picture, visable facts, but you cannot go into the details at only 8fps
Money changing, some times to see slight of hand movements you need as much detail as posible to see the fast movements in the transactions.
Anything running thru a confined corridor or past a open space on the edge of the picture, you will be lucky if you get a little bit of the action, but not enough detail.
Quick Action events are hard to see the detail if you only have the industry standard. Due to this problem we use multiple cameras looking at the same thing at different angles.