Says who? Who says that 1% of divers need DIN? In what agency, manual, guideline?
Using DIN is not like wearing a parachute in Economy class...
I don't know what Agency certified you but this is what
PADI's IDC program states:
DIN (Deutsche Industrie Norm) German Has a
stronger connection between the tank valve and the first stage of the regulator. DIN Valves Screw into the Valve and come in two types a short 5 threads so a tank can only be filled to 232 bar / 3364 psi and a long 7 threads and a tank can now be filled to 300 bar / 4351 psi. This only connection used when a tank is 300 bar / 4351 psi high tank pressure. These are the
preferred valve by Wreck, Cave and Technical divers. The Regulator First Stage has the o-ring, the tank only has a hole with threads. Adaptors and insert can be found to cross convert for these valves.
- Has a better seal.
- Is stronger.
- Can use higher air pressure
- Preferred by Tech divers
- Regulator has the o-ring as the tank does not have one
- Can get adaptors to allow DIN regs on International Valves
DIN is simply
SAFER that's why it became popular with TEC divers. The same as wing BCs or long hoses. Thousands of non-TEC divers adopted those as well.
Preferred doesn't equal
Need. 2 different things.
You will write anything you can in order to make a point BUT once again avoided to answer the question:
Your BUDDY having an Octo makes any difference in 99% of YOUR dives?