It's likely worse than that, because I suspect this study is biased towards flame retardants being effective. It is true in a very narrow range of conditions a

It's likely worse than that, because I suspect this study is biased towards flame retardants being effective. It is true in a very narrow range of conditions a flame retardant can prevent combustion, but it's like an airbag that will only deploy for impacts between 15 and 17 MPH. In real world circumstances with real world combustion sources they don't make a difference.