[LoganDark]

I have never seen any situation where this is not already necessary other than UPnP which already almost never works reliably. A publicly-addressable relay is already practically non-negotiable for anything over the internet.

[lern_too_spel]

IPv6 everywhere makes that not necessary, which is what the author is pushing for.

[direwolf20]

Without NAT, it wouldn't be. That's the point.

[lmm]

uPnP works fine though? What was the problem you had with it?

[LoganDark]

For one, monopolies disabling it by default on their equipment? I remember some years ago having to guess the admin password at a vacation house so I could enable UPnP. It's usually framed as a security vulnerability, even.

[vel0city]

uPnP fails when multiple devices are fighting over the same port assignments. uPnP fails when people have it disabled, as has been recommended many times over the years.