As a software developer on corporate credit card applications, dealing with managing transactions, accounts, and restrictions. Our infrastructure was ACID. We certainly wouldn't have used experimental, flaky datastores like Mongo, and shit was not processed using Excel.

No-one is an expert on every part of a bank's infrastructure -- its too big for that. But definitely, we had software requirements, as a matter of IT policy, that kept stuff like MongoDB out of production.

Yeah, so, you don't work on financial infrastructure. That stuff is almost exclusively eventually consistent. And I wasn't arguing that you should use MongoDB or anything else instead. Merely that claims that ACID is the holy grail of financial software is a myth propagated by people that do not know how international financial traffic works.