Good post Tom, and I know you're putting the reasons out there. But it's interesting to look at the actual effectiveness of a chin strap in preventing mask issues.The lower picture is a good starting point .Most masks fall off,downwards,as in the picture ,travelling in the opposite direction from a straps use. The back band comes off,with or without headwear and since the failure to anchor is at the back of the head .The mask is obviously going to move forward.Again the chinstrap is not in the right position to stop this.If you were to wrap the strap around the back of the neck ,it could prevent forward movement though not downward. Most unmasking happens from collisions or diving.The downward and forward momentum generated would call for a different strap layout to prevent this.In the T Resar incident he seemed to be shot under the mask by the barrel going under and that collision force would have made short work of any small chinstrap.Also the barrel going under was probably a large part of the trauma caused.I work in construction and we have the same issues and the straps are wholly ineffective for similar reasons.While I'm sure the safety of players is paramount, in the more concerted application of the chinstrap. The reality is they are not likely to stop accidents or minimise mask issues. In truth the new "W mini wings layouts " the WPBO have released will do far more to make play safer. Also illustrating the slanted sides of the old A bunker stopped blind crashes far better.If there is a true long term casualty from this safety issue ,it is probably going to be the death of the W bunker in 2018.