Given the choice between bitcoin and what you have suggested (a money that is engineered to lose value over time), any sane person would choose bitcoin. Regardl

Given the choice between bitcoin and what you have suggested (a money that is engineered to lose value over time), any sane person would choose bitcoin. Regardless of whether or not you believe that everyone using an inflationary currency is Pareto optimal (I do not), it is not a stable equilibrium. On the other hand, people using an appreciating asset like Bitcoin forms a Nash equilibrium. The only reason people use inflationary fiat money is that A) it was by far the most convenient thing before Bitcoin (and still is, depending on your use case), B) it has a decent track record for stability, and C) most governments aggressively attack private monies with good monetary properties, often in the name of anti money laundering. More Machiavellian motivations include that governments don't want to lose seigniorage power or control over monetary policy.