The "ecash model" has holes in its actualization path that I'm still waiting to see solved, ie a custodial anarchy so full of anarchist custodians that it is both perfectly anonymous and verifiable and distributed and free of centralizing network effects that it's "90% as good as self-custody with no Wallet of Satoshi disappearing act risks with better privacy." It's more wishful thinking than I'm comfortable with.

The ZK stuff feels a little too much like new, unknown magic to me too.