Not really acceptable for most shop managers who may not technically adept.
They should not have to call their developer to get an export of the products.
Surely it would be trivial to add download links for files in /var/export
then again, maybe it is left off on purpose until dataflow can reliably handle exporting, editing in spreadsheet and then re-importing without losing images, categories etc etc
unfortunately you really do need a developer to do an import export of products.