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1. Most people do not have NFC capable smartphones.
2. I would not feel comfortable scanning an unknown NFC tag. How do I know that the only thing the tag is doing is setting me up for wireless?
3. Enforcing "a phone silence policy for meetings by making all Android users scan the meeting tag" sounds more like punishment for Android users with NFC. Not until every smartphone can be silenced this way would it seem fair. Why not just tell everyone to turn sound off?
4. Tasker is a personal "software only" alternative for Androids. I could probably automate everything on your list with Tasker.