The problem with returning a generic error message for the user is a User Experience (UX) matter. A legitimate user might feel confused with the generic messages, thus making it hard for them to use the application, and might after several retries, leave the application because of its complexity. The decision to return a generic error message can be determined based on the criticality of the application and its data. For example, for critical applications, the team can decide that under the failure scenario, a user will always be redirected to the support page and a generic error message will be returned.

it’s ambiguous whether x-y is the expression x minus y or the invocation of the x-y function. Seems like a bad tradeoff, though. How often do you use -, and how often do you write multiword functions?