You've used the word obvious several times, but strong political opinions and conjecture underlies every aspect of this response. Debt-based economy does not obviously refer to the fact that the dollar is printed by the fed. Your response also doesn't really address how it saves us from the debt based economy that we all have no choice but to participate in. There is no debate about whether sovereign currencies will continue to be maintained by governments. They will, and they will use their military might to protect the sovereignty. Your position here is akin to saying that if I park all my money in gold, I am no longer a victim of the debt based economy.

I don't know if the gradual, typically controlled and predictable inflation of fiat currencies is worse than constant value fluctuations due to speculators in cryptocurrencies, but that's obviously for each individual to determine for themselves.

I am also curious, is it impossible for new BTC (for example) to be minted? Is it possible to change that? My understanding is yes. If so, it sounds like someone could play the same role as the fed there if they really wanted to.

And what happens to the value in the event of a fork of BTC that attempts to make BTC actually useful as a currency instead of just as a commodity? Is this an additional vector of instability in the value of the "currency"?