Sure, i agree. Not everything needs to be saved, but some things should be. We have museums full of modern art, and museums with 4k year old Egyptian stuff. Often the same museum.

I think i may have overstate the "save the old". Its not just about age, although we should save nice things that are old. Its primarily that "big" buildings (new or old) tend to be less human-scale than smaller ones (new or old).