I think it is actually quite advantageous for swingers to actually have the clubshaft level with the ball from a front on or overhead view rather than starting from impact fix address(forward leaning) or literally taken mid-body hands(backward leaning).
What this basically allows is for the initial pressure that you put on the club to be parallel with the plane line which makes it an easier task to launch the clubhead orbit correctly.
Clubhead force and motion per 1-L-11 is at right angles (90 degrees) to the inclined plane and this puts the right angle (tangential force) parallel to the plane line.
This diagram of circular motion (think rock on a string) may make things clear.
If you start with an impact fix address, sending the clubhead on its correct orbit the initial pressure you place on the club will then to be inside of the plane line and mid body just the opposite.