Not saying people can't or won't get addicted to the drugs prescribed by doctors, but there's a lot more checks and oversight to it (these days) than there is for kratom right now.
[†] At least in my mother's case, their EHR system will also flag opioid prescriptions for review by a board.
It may be a lifesaving/life-changing drug for many but it is also potent enough for a single dose to put a non-tolerant user in the dirt and is abusable for non-tolerant users just as any other opiod. It has been popular as a street drug in Europe for example for decades.
Checking on Quick.md, a Telemedicine service that prescribed Suboxone it is indicated for folks who are addicted to fentanyl, heroin, opiod pharmaceuticals and kratom/7OH. If you are not opiod tolerant you can put yourself in a coma today for $100 + pharmacy fees. No need to prove dependancy with a positive drug test, no therapy, nothing.
But how likely are you to become addicted to it? How common are long term negative life outcomes when it is involved?
There are any number of easily available chemicals that can put you in a coma, permanently injure, or kill you. That was never the concern.