There's nothing to agree or disagree about...it's your boat, do or don't do whatever floats it for you.
Fwiw, I didn't make up the directions I've posted--and include in both my books...they're been the recommended procedure for recommissioning RV fresh water systems for more than 30 years. A few boat builders began including 'em in their owners manuals, which is where I first saw them--in the owners manual for a 1985 34' Sea Ray. Today you can find those exact directions on just about every RV site on the net.