It’s backed by math. There is a fixed amount of Bitcoin. We have never had the concept of “digital scarcity” before. There are thousands of computers running independently that are following a consensus algorithm. it’s an open, permisionless, trustless system that anyone on the planet can be part of.
You would rather have money controlled by corrupt governments? Hilarious.
It’s a great place to store and hold wealth.
The concept you are describing is Gresham’s Law. https://bitcoinmagazine.com/culture/how-does-greshams-law-relate-to-bitcoin
Bitcoin is digital gold. Other cryptocurrencies will become used as well for basic payments. Eventually you will be able to pay cross chain so it wont even matter which coins you hold.
Edit: Using ChainLink: https://twitter.com/0xShmn/status/1696169139168059896