You have a ton of studies that says "no" and a few that say "maybe". But you want us to what? Keep studying until it finally says "yes"?
"Check this out, it shows promise"
"Ok." "Oh, it's not as effective as initially thought"
"Ok, but this study says it might be"
"Ok, but we just did a full study that says it's not"
"Ok, but this study"
And on and on. At what point do you say, "Ok, I guess we should move on".
It was never discarded out of hand.