Not a problem. This is determined by code in ways everyone can see and understand. It's actually better than governments printing money whenever they feel like it.
The economic impact of money printing is actually minimal. Most inflation is actually generated by fractional reserve banking and their loans which is already something exchanges do. BTC maxis don't seem to grasp this fact.
> you are asked to trust the developers (technocracy)
You are asked to trust code. Either way I'm actually OK with this. I actually trust them a whole lot more than the communists in charge of my country's economy right now.
> node operators (50%+1 attack and all the usual power dynamics of the rich having more say than the majority)
The only problem with this is it turned out cryptocurrency mining is not actually as decentralized as it was supposed to be. It should have been one CPU one vote but it turned into massive operations involving custom hardware.
New cryptocurrencies need technology to fix that problem. Monero uses ASIC resistant proof of work algorithms to mitigate it.
> The dream of a decentralized, community-run, grassroots infrastructure died sometime around the first GPU PoC - Satoshi themselves expressed discontent, saying GPUs would trivially out-mine the common man.
Exactly. That's the true tragedy of cryptocurrencies.