Should Surface Marker Buoys be Mandatory?

One author says dive-training agencies should teach SMB use, not mandate it, while another says you never really know when you might need it

Delayed Surface Marker Buoy (DSMB)

Scuba Diving Surface Markers

PADI Delayed Surface Marker Buoy

Buy Surface marker Buoy - Scuba Equipments at Temple Adventures

5ft Scuba Diving Surface Marker Buoy (SMB), Safety

Should DSMBs Be Mandatory Safety Equipment?

Surface Marker Buoy (AKA SMB OR DSMB)

Should Surface Marker Buoys be Mandatory?

5ft Red Scuba Diving Open Bottom Surface Marker Buoy

Surface Marker Buoy - Mandatory or Not