You make a good point here regarding stuff one can use when w/d from BZD's; I managed to wean of off Diazepam with the help of Pregabalin (3-4 wk/s at 300-600mg/d), but that drug can be very problematic for some; and in general, after reading a bunch of medical literature there isn't really one specific medication which is proven to work for BZD w/d's, it is pretty much Russian Roulette which will (if any) help.
If find interesting that You say BZD w/d was more manageable than Opiate w/d, I have no experience with Opiates, but from all the reading I've done, people usually say it's the opposite; I guess at the end of the day, it boils down to users individual chemistry.
I can only speak for myself. I did a ton a diazepam and alprazolam alongside a very bad amphetamine addiction. I took diazepam and alprazolam by the 10 pill blister in the end, meaning I took 100mg diazepam or 10mg xanax as a single dose, often washed it down with beer or other booze. Did that daily for a year or more. I stopped without tapering or any comfort meds, I only had some booze and some weed. It wasn't really bad, just bad insomnia for a few weeks, tremors, shaking, pronounced fatigue and anxiety/social phobia. I just stayed in my bed, mainly, reading books or watching tv and it wasn't terrible. I was miserable and useless but nothing dramatic. It lasted for quite a while, though, must have been three weeks or more.
In contrast, morphine withdrawal after a year of heavy poppy pod consumption was bloody hell on earth. Upon stopping the poppy powder ingestion, I collapsed into a completely helpless state of endless agony, writhing around on the bed and also the bathroom floor, puking violently, shitting water, pain everywhere, restless legs, headaches, burning skin (that was the worst symptom!!) , complete insomnia. Like torture, awful, truly awful. Thinking back, I now have to laugh at myself, my condition was so bad it was almost comical. I was unable to write a one word WhatsApp message, my mobile phone dropped out of my hands while trying to type a message.
I think that I am either not susceptible to GABA agonists/modifiers or that a lot of the benzo addicted folks simply don't know what a really hellish withdrawal feels like. The internet is full of people claiming to get horrible WDs from Phenibut, which I abused for months without any obvious withdrawal, just a bit of fatigue and some tremor. People report to get nasty withdrawal from nicotine, Kratom, cannabis or even caffeine, which tells me that a lot of folks simply cannot tolerate the pain/discomfort of mild/moderate withdrawal.
I would gladly take benzo withdrawal over morphine withdrawal any time.....