Montgomery Scott doesn't know?The point is that they don't know.
Geordi LaForge doesn't know?
Miles O'Brien doesn't know?
This is the part of supposition that would make no sense. These men (and other in the Federation) are talented experts in the field of engineering, how could they not be aware of something so basic about how the transporters work?
It isn't a matter of the people who when through the process not being aware that they are a exact copy, it is the the engineers who understand the underlying theory not knowing that the end result is a copy.
How would that be possible?
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How would they know? They know how to take the thing apart and then put it back together but that doesn't mean that they have special insights into the uniqueness of an individual or how it is affected by the transporter. It would be like asking the mechanics that repair your vehicle how to cure car sickness, if you see what I mean.