What if you have a wired and wireless network that are separate? If you only get link-local addresses, you can't see the device from the other network.
If you do get an address other than the link-local address, you will be exposed to the entire Internet unless you have a border router blocking you.
The days of unrestricted end-to-end traffic are gone, and won't be back.
The most that we can hope for is that end-to-end traffic is an option controlled by the local router/firewall administrator, rather than the current situation where many/most ISPs block the access.
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