Yeah, append-only computing is only a good solution in a field where you need to be able to thoroughly, accurately audit the state of the system with 100% non-r

Yeah, append-only computing is only a good solution in a field where you need to be able to thoroughly, accurately audit the state of the system with 100% non-repudiation. Financial and medical data are probably the two biggest areas, though there are others. And you're right, this is a performance killer and a disk eater. I work on backend services that handle financial data, and about 50% of the internal network traffic is the various audit widgets doing their thing.