watchOS was re-enabled in main and xcode12.3
However xharness needs to provide a fat or i386 binary when running introspection for watchOS 3.2 (oldest simulator supported)
Only Xcode 12.0 supported either i386 or x86_64.
Before 12.0 (watchOS 7.0) only i386 was supported.
After 12.0 (watchOS 7.1) only x86_64 is supported.