The dark UI has one huge flaw where it's hard to tell at times whether something is active or not, such as the snapping tool. Sometimes I've had to click it a few times to see which is darker. Why not have it be something that's NOT gray or black? What about a subtle color to highlight or some other effect to show something is on or off?
I should be able to glance at the magnet to know what the state is rather than stare at it or click it twice to check.
Saw this suggested by others. The Light UI is nice but that doesn't solve the issue in the current theme.