You’re overthinking it.
He made a list of PS4 games, using it to demonstrate the Switch has a long way to go to match the library on PS4. I informed him that many games on the PS4 list are or will soon be on the Switch list, demonstrating the gap is not as wide as the long list would suggest.
I understand why you pointed out that many of the games are also on Switch. But not why you didn't mention that most of the games on the Switch list were also on PS4.
If your response was because you thought he portrayed the gap as more wide than it really was, why did you make a comment that demonstrated a gap that is more narrow than your comment would suggest? Because that would just prompt someone to inform you of the same thing.
The difference is he kept things consistent on both sides, while you only excluded multiplatform titles from PS4's side of the list.
Also, I would challenge your idea that a multiplatform inclusive list makes the gap look more wide than if the lists were only comprised of exclusives.
I'm pretty sure it's the other way around.
I have to admit: I'm surprised my post has proven so provocative.
I was reacting only to JRPGfan's post, not the thread in general. He made a list of PS4 games, to show (I'm assuming) how far behind Switch is relative to PS4. I informed him that many of the games on his list are currently on Switch or planned for Switch, because it seemed as if he didn't realize that.
That's really all there is to it.