It’s often said that ‘if it doesn’t come off in the explosion, it won’t come off in service’. So it is highly regarded in hydraulic, pneumatic, medical, deep sea applications etc. in fact any where that abrasive media jams or can’t reach. The advantage of gas is that it does permeate every where - with the more awkward to reach and smaller burrs being more likely to be oxidised - and gas, of course, doesn’t scratch surfaces.