Pulling a meter under load can result in an electric arc that does not happen using the breaker. More so in a high humidity environment.
The electrical code in some areas require a disconnect switch ahead of the meter so that the lineman can open the switch to disconnect the load before pulling the meter.
The 2020 NEC® required an exterior emergency disconnect for one- and two-family dwelling units.
Florida this year adopted Section 225.41 that requires that feeders supplied to one and two-family dwelling units have outside emergency disconnects that are clearly labelled.
This allows first responders to disconnect power on the outside of a dwelling in case of emergency. Without the disconnect, first responders have to pull the meter with the risk of experiencing an arc flash.
230.85 Emergency Disconnects..