I wish something was done about rotation lock for reading in bed. Activating it from Control Center, which itself changes orientation, is maddening.
This seems like an extremely minor thing, and I'm not sure what your proposed solution would be.
What to do about it? I can't presume to know what they tested and rejected, but screen orientation control needs to be independent of screen orientation.
TL;DR: If you have a landscape only app, trigger the lock before you launch the app and it should stay in place.
http://9to5mac.com/2015/09/23/best-iphone-6s-feature-3d-touc...
http://appleinsider.com/articles/15/06/11/first-look-ios-9s-...