Posting tickets can be automated via the command line. A specific configuration can be specified, so that only certain tickets can be posted, etc. (perhaps 1 billing group).
It would be beneficial if Invoicing could also have this logic. This would allow quicker integration with an ERP, and reduced manual labor.
A specific use case would be intra-company sales - These would rarely have any pricing issues etc., - Posting and invoicing them automatically allows them to be imported into the ERP quicker to trigger workflows, and reduces the number of tickets that the billing department spends validating/editing/posting/invoicing.