I believe that perception is key, no-one goes to an art museum to see mouldy artwork on rotted canvasses so why would the public want to see dilapidated military vehicles that are falling apart in a military museum? I have travelled extensively in Europe (on my own dime) and the national museums over there have dropped this antiquated display method in favour of restored vehicles which I feel shows a respect for the artefacts. This respect is in turn passed on to the viewing public who realize that they are not looking at unkempt metal but respected historic items.
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No rusty junk in the Panzer Museum in Munster.