I would have expected to be able to right-click (secondary click) on a thumbnail of a picture and have the contextual menu give me the option to show the original picture document in Finder... but it's not there and I can't find it anywhere.
I couldn't stand iPhoto, but at least it would allow you to access the original file directly in Finder. I understand why the Apple want to restrict direct access to the originals (stops users from moving files and screwing up their library), but what if I want to do something other than email or post the picture to social media?
EDIT: I know I can just "Show Package Contents" or use the terminal to access ~/Pictures/Photos Library and hunt through the folder structure manually, but it's painfully inefficient considering all the sub folders
It may be a (deliberately) missing feature, but if anyone knows any way of jumping directly to the original instead of copying or exporting it, that would be great to know.
UPDATE: I have got used to the way Photos works by now. Basically the thing to do is just to relax, let it manage your collection and only export what you need to as a copy, which you can later add back into Photos when you are finished with it. It is certainly a deliberate design choice by Apple, not a mistake.