In many countries if a doctor believes you're too sick to work you have a right to take leave until you recover, without risking your job and without expending limited "sick days". In those circumstances the doctor will of course prescribe something for your pain, but as a patient you have no incentive to insist the painkiller is strong enough to allow you to continue working.
As I've mentioned elsewhere, the Vioxx scandal is every bit as big as the Purdue one. Check this Wiki (lawsuits): https://en.wikipedia.org/wiki/Rofecoxib
If you've time watch this YouTube video on Merck and the Vioxx scam (if you weren't aware of the facts you'd think you were in Palermo/Mafia territory): https://m.youtube.com/watch?v=K0GrFnOpJoU
My assumption was this was always required to get regulatory approval to make abuse have harsher side effects. Liver toxicity of acetaminophen is pretty bad compared opioid abuse from what I understand