I am creating print PDFs from InDesign that contain Illustrator files. Most of these Illustrator files have black outlines used. When you create a fresh outline with 100% black, it's not set to overprint. And apparently Indesign doesn't give it the overprint attribute either even if "Overprint Black at 100%" is checked, because it's from an embedded file.
So, the print PDFs, in PDF/x-1a standard, have all the black strokes in knock-out mode when I check through the Output Preview.
Now, the only option left is for me to use the "overprint black" option from Edit Colours of Illustrator for hundreds of illustrations and then save and export fresh Indesign PDFs.
Shouldn't black automatically be set to overprint in these software?
What do the pros do in such situations?