Illustrator should be able to export a .pdf NOT save as - I've lost so much work this way - proofing a file with a client as a .pdf should not risk overwriting the original. InDesign and other CSS apps work this way, Exporting rather than Saving As...
There is a very ral risk of overwritng the original file and this is very destructive.
The option to save an illustrator file as a pdf could still be there if people really use that - but ADD the Export as .pdf function.
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