Not sure what you're expecting - Evernote's new owners are updating the basic package for Windows / Android / MacOS / iOS and want (I believe) to get their act together on these platforms before trying to port an effectively completely new app to Linux. They have officially back-burnered Linux development and probably changed the main API around sufficiently that it's currently not add-in friendly. Two third parties - Filterize and Backupery - have withdrawn their own products forinstance until they can rely on a steady interface connection.