The potential for issues there depends on the radius of the curve, which is fairly mild in W11’s case. macOS has had similarly rounded corners since version 10.7 (2011) and has never caused any problems.
The extreme corner radii found in newer designs like M3 Expressive and Liquid Glass on the other hand are flirting with danger with the extent to which they cut into window content.
I've had issues with stuff on status bars getting cut off for programs written before status bars fell out of fashion. This is less of a problem on Mac because backwards compatibility isn't much of a concern there, so nobody expects to be able to run a program written more than a few years ago.
