Fundamental to gaining an understanding of what 'works' is knowing not just the exposure of an image, but its Exposure Value (EV). Showing +/–EV would also help with HDR images. We can see the + and – images, but were they +/– EV 2, 3 or 5? This would be helpful in both Desktop and Mobile (iPadOS) versions.
Besides--DxO PhotoLab shows EV. It's about time Lr caught up!