Not necessarily... the fact that Evernote is unable to edit some formats is not a 'property' - it's a missing function. The editor software is what it is, and can only do so much. To guard against editing, share notes with 'view only' attributes - or safeguard documents in password protected third party formats. We have no idea what may be in the pipeline for new features, but if Evernote doesn't currently have a specific feature, it won't be added anytime soon...