I agree that the apps provided works as intended. They were able to extend the dark mode in the contacts and phone app while leaving the on-call and clock background to blue. Yes, I get that the developers time is limited, but we wouldn't get these complaints if those low hanging UI fix is solved
I actually like using the stock apps, but the moment my alarm clock goes off or someone calls, I'm greeted by this butt-ugly blue background. We're not asking for award-winning material you design. All we ask is update it to #000000.
@treenutz68 suggests that we use alternatives, but aren't we increasing our attack surface? In addition, as @evol pointed out, the alternative clock app barely works.