I totally agree with you that there is, almost certainly, some real benefit to the flush procedure, but it has never been researched because everyone is focussed on stones.
My own gallstone "cure" sounds like a fairy story. Over a year ago, I started getting terrible stomach pain, about 4 hours after I'd eaten. Because I have a hiatus hernia the doc thought "reflux" and gave me medicine accordingly. That didn't work so I was given something stronger, then something stronger still. The pain got worse, so bad that one day I asked for an electrocardiagram as I thought I might have had a heart attack.
Eventually, I became peed off with doctors and decided to do some homework. I chucked the medication and started taking Aloe Vera tablets before each meal, which did reduce the frequency of the attacks. I also found that if, when I got the initial twinges, I sipped a glass of 50/50 red wine & water it didn't develop into full blown pain.
About this time I began to fear stomach cancer, since my father had died of it, so I went to a specialist for an ultrasound scan, which showed a gall bladder about one third full of small stones. This was followed by an ERCP, which did not reveal any stones in the ducts, but showed a slightly enlarged liver.
The specialist recommended ultra sound breaking up of the stones, but I was reluctant because of the time and cost involved and also because I found him repulsive. (Slimy type).
That's when I first found CureZone and considered a flush, but read that you shouldn't do it when having pain, so I began drinking gallons of apple juice to soften the stones. The frequency of the pain attacks continued to diminish, but boy - when I got them it was agony and, by now, I looked like a wizened skeleton because for months I'd been frightened of eating.
Now for the too good to be true bit. The morning after one very painful night I discovered an old man who sold boxes of dried herbs which he claimed would help with just about anything, from migraine to high cholesterol. I bought 15 boxes and started having a brew of his tea every morning and evening. I HAVE NEVER HAD ANOTHER GALLSTONE PAIN.