I think you're mistaking speculatory gains for deflation, but that's a whole other conversation. Purchasing power stability is simply a mathematical trick. An accounting tool. It does not address any actual natural economic function. Your hypothetical about owing someone a debt of 1 BTC is true... but it is 100% dependent on the fact that 1 USD has no real value, because it has no valuable backing. Since BTC is "backed" by the USD and the USD/BTC price pair is driven by speculation, the situation you describe arises. While this makes BTC a good speculative tool to create shadow value, it does not in any way translate to real value. Your answer is to destroy crypto. My answer is to use crypto as a currency tied to real value, which a market is fully capable of doing on its own, given adoption. Crypto can never be the "future" unless it's adopted for use as a currency. That I agree. If/once it does become widely adopted, it becomes valued based on market principles, not the USD/BTC pair. "How many apples can I buy with a bitcoin" replaces the question of "How many dollars can I buy with a bitcoin." In order for something to deflate, the real values must be compared.
This is the problem with Keynesian economics... the idea completely eschews *actual* economic laws of real value in exchange for mathematical tricks.
To address your post edit that I'm advocating for more depression: You're saying that because removing the gold standard (sort of) helped get the economy out of the great depression (arguable) that having a gold standard causes depressions. I shouldn't have to point out the logical fallacy there. Bad speculation caused the depression. Stocks in general are a horrible idea. It can't be stopped really, but the consequences of speculating badly are losing your money.
You're mistaking what I'm saying about Bitcoin being unable to be manipulated. The manipulation risks of Bitcoin are predicated on the interaction between it and other value stores. If those value stores are manipulated, and Bitcoin traded against those manipulated values, then yes, the result is going to be manipulation of Bitcoin's price relative to other value stores. Bitcoin's *real* value, if it were to have such a thing (it doesn't at the moment, due to its lack of usage as an actual tendered currency) cannot be manipulated. Speculation risk and manipulation is completely different. Pump and dumps do exist in crypto. I'm not denying that sort of manipulation does happen, but that is a completely different topic. Moreover, it falls right back to the fact that it is the dollar/BTC conversion that is being manipulated, not Bitcoin itself.
Name one time that the Federal Reserve "manipulated" the USD for its own advantage.
https://www.federalreserve.gov/monetarypolicy.htm
Once again, we're back to name-calling. (Although I'm guilty of that, especially with you Ford, so I don't take it nearly as harshly coming from you...) But you saying someone, or their beliefs are grossly ignorant does not make it so. Claims about "most economists" usually refers to "most economists who agree with my viewpoint." Keynesian economists tend to be against crypto. Classical economists tend to be pro. And since Keynesian economists are the ones that support the current system, they tend to get all the press.
There is nothing about currency that requires oversight and control by an organization outside of its users. That claim simply is not true. If Bill and I agree that one rock equals two apples, we have a currency. It's a terrible currency, because rocks are everywhere, and you can always get more... but that's basically the Federal Reserve, now isn't it?