Yes - Widening the Angle of Approach is accomplished by shallowing the plane.
Back to topic - My personal opinion about "frozen" is that once the right wrist is in position, it stays quiet. I think some players can handle a loosey goosie right wrist because they have enough pivot coordination and lag feel to bring it through impact bent and level.
For uncoordinated dorks like me, I need to feel the right wrist very stationary. Just one less thing to worry about.
I am with you there. I don't have the talent or the coordination to be able to handle a loosey goosie right wrist in my swing.
Alex