Just as bow hunting, handgun hunting and muzzleloader hunting are most often used under their individual limitations so is hunting with a sub-sonic suppressed rifle, or at least it should be. Were it legal to spot and stalk or still hunt deer or antelope in open country I certainly wouldn't take my 45 ACP M98. However, if i was sitting in a blind next to a waterhole where shots wouldn't be over 100 yards? Also, if sitting in a blind down Texas way to shoot pigs coming into a feeder not more than 100 yards away. I won't hesitate to use the M98 45 ACP suppressed.
"Hunting" is done in many different ways not only throughout the world but in this country too. Because it's not the way we might hunt doesn't make it wrong.