TGM gives golfers and teachers a common language. The rest of the golf world is still at the Tower of Babel.
The REST OF THE GOLF WORLD has terms, but they may mean various things. The terms OPEN CLUBFACE, SHUT CLUBFACE, TURNED, FANNED, PLANE, LOW POINT, LAG, and many others are all used by THE REST OF THE GOLF WORLD, but may have various definitions.
TGM may be the only way that a golfer can write his swing(STROKE PATTERN) down, and pretty much every other TGM educated golfer can understand what he means. THE REST OF THE GOLF WORLD would have a hard time doing this.
Have you tried to write your swing down? Try it... 12-4. Now try say John Daly.