The surgeon made a comment about roughly 3% of people having side effects, but I'll have to say that I'm skeptical. The way he said it made me think he was just repeating a line he'd heard years ago and never questioned. Certainly, he never knew how I ended up and made no effort to find out. His interest was in the surgery itself, not the eventual consequences of the lack of a gall bladder.
The gastroenterologist, on the other hand, seemed to imply that problems were a lot more common than 3%, but I was too busy telling him about my problems to even ask about statistics.
And then, after surgery, far more than 3% of others I've spoken to have had various problems, BUT it's still clearly a minority.
So, in all of these three "data sources" of mine, I'm guessing about tone of voice, getting an impression, and so on--not very reliable statistically, I'm afraid, but I'm trying to be both honest and somewhat detailed here in case it proves useful to someone.
I think your understanding is correct that 1) the removal (meaning process of extraction) has been essentially perfected, and 2) that it is considered safe for a (very?) high percentage of patients. It also seems to me that if you are going through the agony of gallstones, you'd do better to live without a gallbladder than to live with gallstones.
What I object to is the BBC putting an article out there that basically claims that science has proven that the gallbladder has no useful function and that the only risk in removing it is the risk of the actual cutting itself. Nonsense. Just being a "bladder for gall" was making it possible for me to work outside the home, go on business trips, vacations, etc.--a very useful function whose loss I have to compensate for with daily medication.