That’s technically true and also the reason why a 60FPS locked game can indeed look smoother on a 120Hz display compared to 60Hz. Because 60FPS don’t always hold a steady 16.67ms between each frame so it could happen that on a 60Hz display you’ll see a frame twice and skip another one instead.
Nowadays you ideally have a monitor which supports variable refresh rate so this becomes a non issue because every single frame now gets his own refresh.
Voyager is all you’ll ever need^^