Often the error was caused by an intermittent problem, and trying again (an hour later; a day later) does indeed work. As for developers, errors details may be

Often the error was caused by an intermittent problem, and trying again (an hour later; a day later) does indeed work. As for developers, errors details may be separately logged elsewhere. So they don't need any specifics about the error from the user. Finally if you show error details to the user in production, it may lead to leaking sensitive information (PII or system internals that may ease hacking).