joelunger

What specifically do you think is a poor use of screen space?

Confirmed. The screenshot renders the blurry panels as solid.

I'm skilled in the art of breaking shit, I guess ;)

Try going full screen and back again quickly. Try flipping through view modes in finder. Try dragging the sidebar width on the inside edge of finder.

I'm on a Retina MBP. I installed it on a new partition.

I think it tends to allow more color to come through in an otherwise sea of gray panels. Visually differentiating panels is not just aesthetics, but usability.