Suggestion: I prefer the now old style of window decorations. Recognizing that alot of work gets put into development, simply removing the new style would be disrespectful to whomever made it. Therefore, as a compromise: the old style should be toggleable, or atleast made into a seperate decoration package like Oxygen is.

There is already a color gradient toggle, one swapping the border for the rim highlight seems reasonable. It is still being used in the Breeze gtk theme at the moment, so until those match either way Breeze lacks coherence. The code for both styles of decoration already exists as well, the issue would be one of integrating them into a combined package.