3) Privacy problem -> Theymos (or whoever is doing approvals) would know which node is mine.
theymos believes that Bitcoin users should be running full nodes from home. This is one reason why he has taken such a strong handed stance against discussion about the block size increase proposals because increasing the maximum allowed block size will make running a full node from home more expensive (in addition to the "forced consensus" that some proposals have stated they would use to fork Bitcoin).
theymos has access to everyone's IP address when they access the forum, therefore he already knows which full node running from home is belonging to you
@Jet Cash -- there is no such thing as "proof of full node" in the Bitcoin protocol as Bitcoin uses Proof of Work to find blocks. It is also not very difficult to make it appear to others that you are running a full node when in fact you are not -- this is even in the default settings of Bitcoin Core via only keeping 300 MB worth of blockchain data. One might even be able to use the API of a block explorer to serve theymos "proof" of running a full node.
It might be beneficial to have a board dedicated to the discussion regarding running a full node (both a Bitcoin full node, altcoin full nodes, and fake full nodes), including things like security best practices around full nodes. However a lot of this can already be discussed in the technical related boards.