Your complaint about bitcoin boils down to this: You can't force people to use their savings on what you want them to use it for. I regard that as a feature, not a bug.
If an country would adopt this "feature" in it's currency then it will soon fall behind competitiveness, because it hurts both trade and production. That is why countries are not using this model. The bitcoin community isn't a pack of tortured geniuses who knows the answer how to prosper, while the rest of the world is just so dumb, that they wont understand the enlightened truth. This is the work of the cult mentality that I've been talking about.
There are two reasons why "countries", really governments of countries, wants fiat money in stead of sound money. Number one is that they can repeatedly, without their subjects discovering, steal from the money supply. Number two is that they think they can force investments through the zero interest rate policy. They can not really, because the credit made available goes to suboptimal production, sometimes even capital consumption, taking everybody down in the process.
Sound money (of which bitcoin is an example) is in the interest of everyone except governments of countries.