The issue which I understand is primary with fentanyl is purchasing black market fentanyl and selling it on the street as heroin or whatever other opiate and cutting it with various things leading to a wild variety of potency of street drugs, even within the same purchase (poorly ground, poorly mixed) which leads drug users to overdose much more frequently.

Fentanyl, absolutely is safer than many other popular pharmaceutical opiates but only when the dosing is done competently and accurately (even someone abusing opiates is safer using fentanyl IFF they are capable of knowing and distributing their desired dose)

Exactly. It would be better to dissolve easily-measurable-at-home quantities into large volumes of fluid, but it's hard to make powdered synthetic H substitutes that way.

Properly micronized and triturated, synthetic H made with fentanyl would be very safe stuff. Unless you could afford enough to OD yourself, which you might now be able to at the prices it could be sold at.