I have worked in FSIs and the DBAs I met were absolutely paranoid about consistency and durability of writes to core banking databases. Curiously it was atomic

I have worked in FSIs and the DBAs I met were absolutely paranoid about consistency and durability of writes to core banking databases. Curiously it was atomicity and isolation that took a back seat, errors due to those would be corrected by applications (or by hand in exception processing) with reversing transactions.