I got the translucent drag bars to work pretty easily, but window outlines are still just one pixel,
That's a deal breaker for everyone who has turned on focus-follows mouse and turned off click-to-raise. I.e. good old X11 behavior that lets you copy/paste between overlapping windows while maintaining Z-order.
But these days almost all users run everything full screen, and have to context switch. Sigh. Dumbing down all over.