A store of value protected from (and even a beneficiary of) government mismanagement, central bank mismanagement, corporate mismanagement, etc.
Because we are forced to generally keep our wealth in things susceptible to political influence it’s nice to have a place to store value away from that.
My homes value can be wrecked by a variety of government or central bank policies. Same with my equities and bonds. So having a part of your wealth in BTC is frugal as a protection from these things. It is outside the scope of these influences.