It’s like discussing a fully rendered concept art. You will get lost in the picture. And there’s always the slight suggestion “it’s already looking so nice, why think harder”. Which is why sketches and roughly painted thumbnails are best for brainstorming. Easier to think out of the box that way.

Same with demo. Do a rough wireframe or something with default bootstrap style and it’s way easier to target the meat of the problem. Not so much on a full site