According to the article, since the 2008 recession, the federal reserve uses a set of “stress tests” to ensure the bank has enough to handle an emergency. Presumably it handles different mixes of customers and accounts better, as well as different types of emergencies. The banks claim that results in them having to hold too much reserve cash to handle “unpredictable” results.

Oh darn, they can handle emergencies better. Don’t you hate when that happens? Real emergencies should be more predictable, and none of this would be necessary