I cannot imagine anything that looks so idiotic (sometimes seen it on old flying movies with poncy actors in the cockpit) than the automatic pilot in control and a pilot "following" with his sweaty mitts grasping the wheel in eager anticipation he may have to save the aeroplane fron crashing
You've never flown an Airbus have you, nor one that without an bloody warning suddenly goes into FLARE mode at 500ft AGL.
WRT the original thread question, I
guard the stick for TO and LDG in case of:
1. FO (PF) incapacitation (subtle or otherwise)
2. If the FO actions are obvious that he's going to do something that will get me fired.
3. If he's in the process of doing something that will get me fired.
In all cases I call "I HAVE CONTROL" simultaneously pushing the little red button.