I used to have a pair of floorstanding speakers 20 years ago. So didn't have a chance to compare them with bookshelf+sub.

Let's assume you play them with a low to medium volume, in a sound treated room, at the triangle listening position, could you hear much difference in terms of sound clarity, soundstage?

I feel that the dynamics of volume and frequency have different impact. I would start a new thread to discuss this topic so experts or even speaker designers could shed some light on it for me.