> Fortunately, it's all context-dependent. So when you watch a video that is inherently rectangular on a Mac, that takes precedence. It's only shown below the notch, and the rounded corners on the bottom disappear.

Also, it's worth noting that notches are a hardware-specific. I haven't tried any of the MBAs with notches, but the MBPs have good-enough black levels that the notch just kind of vanishes into the black background when using full-screen apps.