I sort of agree wrt museums and sort of don't. I think it's amazing when precious keys to understanding our national/global past can be preserved and observed at the highest level.
However, I think that also has the danger of diminishing the actual inherent value of many things, as their (original) context of meaning was firmly within the realms of their part in the everyday lives of individuals and families.
Take medals, for example: if a VC was struck in honour of (and engraved with the name of) Bob Smith, but then sent straight to a national museum, so that everybody could see and enjoy it from the start, how much less special would that be to Bob and his family? How could they easily treasure and enjoy it when, to them, it only effectively exists 'in theory'; i.e. it does exist, but it's a bit like one of those schemes whereby you name a star after a loved one: a nice little honour, but hardly enduring or massively meaningful.
It may be that Bob is relatively young and in good health and lives 10 minutes from the museum, so he could go and see it regularly (one would hope, with a complimentary lifetime entry pass); but if (as is more likely), he's an older gentleman, living maybe 2+ hours away from the museum, that would mean that his award effectively being instantly removed from his life, so that hundreds of thousands of strangers could shuffle past and, if they even notice it, ask "Bob who - is he famous?!"
The truth being that, to the world, he isn't famous in the least; but to his family, he's a vital, central figure of honour and respect. Of course, they know that anyway, but having his medal on display or in a nice box that can be picked up and opened at any time is a permanent validation of that and confirmation that his life and contribution were acknowledged by the nation.