I'm not quite sure whether this post belongs in a Design forum or here, but with iOS 18 Developer Beta 1 and watchOS 11 Developer Beta 1, when a Live Activity is displayed on an Apple Watch, the system font used is SF Pro rather than SF Compact.
I would expect that the design guidance would be to stick with SF Compact while on watchOS, and I would expect that the system font, when displayed on the Apple Watch using .supplementalActivityFamilies([.small]), would appear as SF Compact.
To ensure that SF Compact appears on my Live Activity when viewed on Apple Watch, I can set a custom font for use with the small supplemental family, but this seems really clunky; is there any other guidance here?