File > Share is the same, just more user friendly language. I get it's a bit confusing if you've been using computers for a long time (it's certainly caught me out), but 'Share' makes much more sense. Especially because export/save to disk is only one of the multiple 'Share' options available.
Yes! It makes total sense to share with myself a Pages document as PDF! I‘ll promptly think of sharing if all I want to do is save/export a file in a different format. I think we can extend that helpful language to the entire OS! No need for a “copy” or “download” button, it’s all sharing, one way or another! Share share share!
"Export" means "save this working file in one of many formats, including possibly other formats that are first-class in third-party apps but not this app"
