It is.
People usually ignore it but just do a simple calculation, your fiat against bitcoin's growth and see how much return it could give you by simply holding it.
Bitcoin outperform gold, and other assets including all fiat in this world. It is the ultimate saving tool but majority of people aren't noticing it yet.

If it's not an ultimate savings tool considering the growth between decades, then I wonder what is, nothing else outperforms bitcoin.