Thank you for your post.
The Set Allowed Orientation script step was deprecated in FileMaker 15 and it has been removed from FileMaker 16. The link you provided explains the reason.
Does this mean that the company that teaches us best User Experience over the last decades (Apple Inc.) and it's subsidiary (FMI) are unable to fix this?!!
This is ridiculous.
Are we supposed to build every iOS Layout twice to work out orientation changes?
RickKalman, saddle your bicycle, ride over to Cupertino and work this out
As mentioned before, OrientationLock still works with FMGo15 with latest iOS