As Johhny Miller indicates in this months Golf Digest, must l maintain my right wrist angle at impact for solid iron strikes?

The answer is yes, but..

This is one of those things that happens, not something you force to happen. If the downswing occurs in the proper sequence, with the lower body turning to the left and out of the way, then the arms will lead the club and arrive at impact in the proper wrist position. Its the turn of the body that causes this.

You must retain a right wrist angle prior to impact in order to get solid iron shots because the wrists fold in the opposite manner after impact. This is where power is released causing the ball is forward motion.

Technically..Yes. However this is not something that you can control...It comes about naturally within the context of a good golf swing..Its more a result of than a specific part of the swing that you need to concentrate on trying to change...People who try to affect this aspect of their swing tend to over do it and end up with fat duck hooks for the most part

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Yes you should. But from now on, if l were you, l would not try anything that those magazines say to do. It will fill your head with mechanics of the swing and all you will do is think about that. You should find an instructor if you are having problems and want to get better.