I'm not a fan of Plasma's new default color scheme... It seems like a small and subtle thing, but the devil's in the details - that gray just looks so dull! Dare I say - Adwaitian! I like Breeze Classic much better, especially when used with dark Plasma theme (which is also much better than the default light one). Adds some contrast and clarity. Attempting to blend title bar with window content feels so 2010:)