External Flat File Import - Wrong Class

Hi,

While using external journal upload if there is a wrong journal class.the process goes to no success.However in the message log the process displays the business unit & journal id.They do however mention that a rollback has happened.Couple of questions on this are,

1. Shouldnt the data be validated before being loaded especially if its header data? Validation is happening anyway post upload but  prior validation would actually save process time in case of error entry . 

2. Creating journal id might be misleading to end users who might be confused considering they might not be aware of terminologies like rollback( user eductaion might be done however as workaround).