If you live in a country with a highly functional banking system and no kleptocracy, Bitcoin is probably a bit puzzling unless you have family in Cuba. But it's not puzzling at all for those of us who live somewhere in the middle of the broad spectrum between Switzerland and Somalia, because most places have
a little kleptocracy. Argentina is far from being "a failed state," but if you want to send US$500 abroad via non-Bitcoin means it's basically impossible, and the only broadly available savings vehicle is real estate ("
ahorrar en ladrillos"), which of course grossly inflates real-estate prices, with a substantial part of the capital city occupied by empty apartments someone bought "as an investment". Historically Argentines have saved by buying dollars but that's limited to US$200 a month now, and then only if you have a non-under-the-table job (about a third of total employment is under the table):
https://www.ambito.com/finanzas/dolares/cronologia-del-cepo-...
You can see that in September 02019 when this measure was imposed the price of a dollar was AR$63.50; now it's AR$147. So whatever savings you had in pesos in 02019 have lost 57% of their value to peso devaluation.
In 02001 a lot of Argentines had saved dollars in their dollar-denominated bank accounts. This did not preserve their savings through the financial crisis that year; the cash-strapped government limited withdrawals to a trickle, then converted dollar deposits to pesos at a one-to-one rate, then released the exchange-rate peg, at which point peso went overnight from being worth US$1 to being worth US$0.25 before settling at about US$0.31 for the next few years.
You suggest, "alternatives to banks like credit unions where customers—as owners—hold more power," but Credicoop depositors suffered the same two-thirds confiscation of savings as depositors in for-profit banks. And they pay the same 3% tax on bank transactions including checks. That's more than a fast Bitcoin transaction fee of US$15 for transactions over US$500.
But we're not a failed state. There are no gangs of bandits roving the streets in Argentine cities (though there are some pretty bad slums where you'll get robbed if you wander in without knowing anybody). Courts, free public hospitals, and roads continue to function, though there are more potholes than a year ago. Argentine infant mortality is 10 per 1000 live births, down from almost 20 in the late 01990s and the same as the late 01980s in the US; life expectancy at birth is 77 years, worse than Switzerland's 84, but the same as China and Hungary, and better than Saudi or Mexico. (Somalia is 54.)
Most of the world is worse off than Argentina, although not necessarily in such a statistically transparent fashion. About one fourth of the people in the world are unbanked, 51% here in Argentina; even advanced countries like Russia, Hungary, and Uruguay have roughly a quarter of the population unbanked:
https://www.gfmag.com/global-data/economic-data/worlds-most-...
And if your family lives in a country like Iran or Venezuela subject to US sanctions, and you live in the US? Good luck sending them an ACH, instant or otherwise! It's well known that Bitcoin is very popular in Venezuela, which kind of is a failed state, so one of the Venezuelan governments is trying to tax Bitcoin remittances at 15%.
https://archive.fo/ZRXzS
Bitcoin handles a few billion dollars per year in such remittances. This might seem like a trivial amount of money to someone in a rich country, but in poor countries, it's enough to keep several million people alive.
Even in the US, it's common for the police to confiscate large amounts of paper currency just because they can ("civil forfeiture"); US bank accounts are probably fine for US$100K but probably somewhat risky for US$10M if the bank thinks you don't seem like the kind of person who ought to have it. US$10M in US$100 bills fits in a box you can wheel around on a dolly, but Bitcoin is a lot more practical. (And of course US$10M in dollar bills loses about US$200k per year to inflation.)
So, Bitcoin doesn't have to be a cypherpunk utopia to be a big improvement on the status quo ante. For those of you living in stable countries where your worries are things like "instant and extremely low-fee ACHs" and "decentralized utopia", this may be very confusing, but try to remember that most of the world lives in places with much more pressing concerns, concerns that Bitcoin helps a lot with. And you may live there too, soon — the loyal subjects of Kaiser Wilhelm in 01913 certainly didn't expect that in 15 years they'd be in the middle of a hyperinflation episode that remains legendary a century later.