It really does - you can still get horrible tearing over 60fps. I notice when gsync isn't on even at 70-75fps.
Depends on the game ofc.
That said, buying an Octane just for gsync is a hard sell.
Must admit I've never noticed this but I don't game on a monitor so maybe that would be why
TV and streaming via Shield, it may take care of stuff like that.
Lappy has G-Sync so can't argue that it's great tech. I just wouldn't push for it at 1080p nowadays, but take the point that syncing is good regardless of framerates.