Your fish clearly developed a fear of you and the bamboo to the point of hiding when he sees you or the stick, while sunnysjourney's fish, if he is to be believed, benaves normally and is not traumatized. This seems natural, and I know the appearance of a dominant fish may cause the same behavior, but the fish very clearly remembers fear, even if it was never in physical pain, while the 'clipped' fish seems not to. Being continuously intimidated and forced to back down is very stressful; when people do it to each other we call it bullying.
I am not calling you cruel, even if, reading what I just wrote, I realize I may sound like I did. I think what you did was genius, creating an imaginary "boss fish" that does not tolerate any fighting or harassment, which allows for your fish to get along when they otherwise wouldn't, and is probably far more effective than trimming fins because it eliminates conflict, rather than simply make the fish incapable of hurting each other. I am just trying to explain why I think it is more traumatic than trimming fins.