IMHO sharing issues are not really a problem with Gmail and Google Drive stuff. I don't use it a lot, but it is occasionally very useful to be able to share a doc via Drive and have two parties be able to work on it and update in near realtime. However, there is no reason one has to use those sharing options if you don't want to. With Gmail or Outlook.com it is still perfectly possibly to just attach something to an email and do it that way.
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