if vsync is no helping on tearing. You are either doing it wrong or don't know what tearing is.tearing and slow, and VSync does not help much.
and for all these kind of arguments. I would like to see the non placebo filled ABX test
and again if you Render cycles can keep up with your refresh cycles Gsync/freesync does nothing ( there is no need for freesync/gsync to slow down the monitor)