you fling around words like "network maintainers" quite casually, dont you? :)
its really extremely simple, just dont NAT, is that really so hard? just because you dont NAT, doesnt mean you have to let the traffic pass through, that is also an extremely simple concept, no?
Fling it around?
There are a shitload of people who maintain networks, like home or small business networks, that aren’t network administrators. Most of those people are not prepared to have their Chinese WiFi cameras, myriad smart appliances, and heck, even home computers easily individually accessible from the internet. It’s an extremely simple concept, no?