Asking what value a particular app gets from an ACID store vs a non-ACID store as part of a comprehensive analysis of two competing technologies is a GOOD THING.
As for banks, exchanges, credit cards, packages, etc:
When non-trivial sums of money are changing hands, ACID stores offer tremendous benefits as a building block in a larger system.
Yes, things go wrong. Even given ACID building blocks, building huge banking systems is hard. Forcing bank developers to worry about consistency not just between systems, but also within systems isn't going to make that job easier.
As for banks, exchanges, credit cards, packages, etc:
When non-trivial sums of money are changing hands, ACID stores offer tremendous benefits as a building block in a larger system.
Yes, things go wrong. Even given ACID building blocks, building huge banking systems is hard. Forcing bank developers to worry about consistency not just between systems, but also within systems isn't going to make that job easier.