Bitcoin is uniquely suited for saving for many reasons, but the most important may be that there is equal overhead for saving 1 sat or saving 1 hundred million sats.

Most assets or goods imply some cost or overhead to stockpile and save. This can conflict with marginal utility: since you don't need the good to satisfy a pressing need today, the "cost" of storing it long-term has to work out with regard to your confidence that you will need it in the future for a more pressing need later.

That conflict is removed when there is low to no cost for saving arbitrary units.