The reason it’s cut is mainly because of capitalism and it being illegal. Imagine if alcohol was still illegal, we’d be getting bad moonshine with methanol still in it.

But fentanyl is cheaper and more readily available than opium so capitalism is gonna go do it’s thing. Until it’s legalized and regulated heroin will never just be heroin unless you grow the opium poppies yourself and process them into heroin yourself.

I’d also argue with my tinfoil hat on that the introduction of fentanyl to the heroin supply was intentional, and that are sudden opiate epidemic blamed of pills just happens to coincide with the war on terror - and afghanistan is where heroin comes from. I’d argue the US government brought heroin back into popular use and the Chinese government decided it would finally get long awaited revenge for the opium wars. Both governments get to kill our undesirables. Win win for the elites, less moochers living off the system in their eyes.