I wish they would add *BACK* a freaking hint of contrast in apps like Mail so the folders bar, commands up top, emails/folder summary, and email preview didn’t all blend together in a complete white-out!
Edit: I added *BACK* because the OS interface for Mail (and other native apps) used to be quite attractive *and* intuitive with how it was laid out before Mac OS was “improved” to the minimalist white-out it is today.
Edit #2: I’ve been experimenting since day 1 with increase contrast and other adjustments Apple condescendingly and dismissively hides under “Accessibility.” Not enough improvement/change back to similar to how it was before. Those settings belong under a section titled “Common Sense and Intuitive User Interface Element Options” and not “Accessibility.”