In T10201#189792, @ngraham wrote:

In T10201#189791, @alex-l wrote:

The important thing is preserving the current ease in distinguishing active window from inactives (for all windows, not only Qt/KDE ones)

Absolutely. It's a top priority. In addition, I think this will be improved for Breeze Light and Breeze dark, which currently have virtually no visual difference for active vs inactive windows.

@lavender By inefficiency, I mean usability, being brain-friendly.

FTR, the "Breeze" color palette proposed in Konsole is obviously not workable.
For the most obvious breakage: look at any manpage and you'll see (or won't see actually) that bright and dark text are indistinguishable!
You need to stick more closely to the standard, and only slightly adjust it.
Before you release a theme, check all combinations of colors to make sure there are distinguishable from each others (fg, bg, bright, dim).
I feel stupid for having to mention that, but, heck, I also feel that if I don't do it, you're gonna forget to check that again!

TLDR: Where would you recommend me to go if Breeze is not my cup of tea?