Saving vs Preserving: These important historical scientific devices might be fun to view later. It is interesting to think about these MASSIVE aerospace museums

Saving vs Preserving: These important historical scientific devices might be fun to view later. It is interesting to think about these MASSIVE aerospace museums with hundreds of planes, like one out in Tucson, AZ. Just hangars and hangars of historical planes, with a few historically interested visitors. How much preservation is the right amount?