So, I did let her know that a storage volume was going to be more difficult to manage, could result in lost data, and would make the data harder to work with - I mentioned it's not the end of the world if it works, it was just a professional suggestion.

To me, there are different levels to "just being believed". If a mechanic tells you your car isn't working because you don't have an alternator, does that really need scrutiny? If you don't understand the subject matter, at some point you have to "just believe" someone else.

Especially for a non-technical user, trusting the software developers at your company on technical advice should be a given.