Why are you repeating back to me what i just said, rephrased, after disagreeing with me? seems odd Bud .
From my own personal testing I can say that it is NOT a good experience and my experience is that image persistence becomes a HUGE problem when fps starts dipping lower than 60, which is why I have said multiple times in the past that I don't care about a VVR floor lower than 40 cause I won't be playing games at lower than 55ish. Doesn't matter if it's on a Gsync panel or a Freesync(although LFC is plague with flickering on a lot of freesync panels but that's a non issue for me...can you guess why?), in my very honest from the heart opinion, it just *****. I just don't enjoy playing power point slides.
Well if that video shows me anything it is that, compared to my own standards, your requirements for the use of the word smooth are rather low and if a mouse was used in this same scenario the word smooth wouldn't even be possible to utter. Again my personal opinion, not an attack on your person, but instead a disagreement with your statements about the word smooth and how/when to use of it. In the end it's personal preference.
I believe by smooth he means no weird jarring stutters that you would notice with normal vsync, so from what both of you guys have showed me it seems I would be fine with the frame doubling, I probably wouldnt care about the input lag. I am not a twitch gamer.
With normal vsync if a game drops to 14fps even for a brief moment its jarring and stuttery. Nothing like whats in that video.