launcherIcon is required

https://developer.garmin.com/connect-iq/programmers-guide/entry-points/

"The name and launcherIcon attributes must specify a resource ID that is defined in the app resources. If a launcherIcon isn’t specified a default icon will be compiled into the application."

Well, that's not true.
launcherIcon is mandatory and monkeyc won't compile if icon is not set.

ERROR: A launcher icon must be set in the manifest.
com.garmin.connectiq.common.manifest.ManifestException: [102] A launcher icon must be set in the manifest.