The club is designed on a plane. When you move it, it impacts the way it is designed and as you say, with a bit of shaft droop due to the movement of the club.
Since it is the movement of the golf club causes shaft droop, then the way you move the golf club affects shaft droop.
For example, If i swing a golf club back with the face closed, the center of the golf club is in a different alignment with the shaft then if I swing the club back with the face open.
The CG of the club and shaft are present during the swing and therefore can be altered.
The same is true with swing plane. The club is designed with a plane, You must be on plane to strike the golf club. When you do not move the club on plane, you drastically alter where it can achieve impact.