The legacy version offered a fast workflow for me: I could add (or attach) a pdf file to a new note and conveniently the filename appeared as the title. With version 10.4.3 I have to type the title myself, very annoying.
I have saved many encrypted pdf files in Evernote. No problem for the legacy version: I can enter the password and view the pdf file. But the new version 10.4.3 still doesn't offer this option.