Hot Line, you've hit on the point of this thread..the NEC simply say to support the pipe; it does not specify how.
Now, many would say that the code needs to be more specific, that listing bodies need a wider fief; I disagree.
An AHJ, using the NECA workmansip standard as a guide, would not allow this strapping.
"Electric Work" is not just a job...it's both a SKILLED trade, and a professional. A journeyman is hired for his knowledge, experience, and judgement. You just can't get around having to make many, many judgement calls every day.
