Personally HSA is not a myth. Its just that flavor stability and longevity is much more important on the commercial level than it is to those going through a thimble of the amount of beer most commercial operations handle. Its easy to say HSA doesn't make a difference when your drinking your corny keg. But when it comes to selling your beer commercially your not rolling the dice in any way with practices that could influence the bottom line. There's a reason breweries go through the lengths they do to not compromise on the quality of their beers.