Really? How negligible is it when the ATF gets to change the definition of a machine gun as defined in the Gun Control Act and National Firearms Act? And only the Fifth Circuit has ruled that bump stocks cannot be classified as a machine gun. So for most of the US the Federal ban is still in place. Which means that for most of the US, people had their bump stock turned into an illegal device with no compensation, etc.
It will take years to unwind the mess that President Trump caused with that ruling. Perhaps now that there is a circuit split, the Supreme Court will take up bump stocks, something that they have declined to do several times.
The ban is meaningless in the long run as House Republicans are going after the ATF. The ATF has no power. It was a flop poker hand by Trump to get the gun control morons off his back.