How is this better than literal cash in a safe?
The standard reason not to literally store significant cash in physical currency form is that inflation will eat it. But inflation will eat a 0% T-bill just as fast, and safe deposit boxes are probably cheaper than the fees.
Or is it just that cash in a safe just seems incredibly unsophisticated?
Or is it this question just part of my tendency to look at the low-tech solution? I once wrote a manual for a pointed stick, and one of the things I love about my new profession is that the highest technology I use is a warm rock.