Firstly, I’ve tried most of the mainstream alternative treatments and a few that are less well known. I have indeed been to several acupuncturists, and can only say it was a worthless and expensive way to have someone prick my skin.
With regards to the length of time it’s been in use, you are actually wrong it is more like 2000 years give or take a century. That being said, who cares? We bled people to death thinking it was an effective medical treatment for 1000s of years until we realized that blood os actually kind of important. Using a useless treatment for a while doesn’t make it effective, it just makes the people who continue to use it misguided.