[chongli]

I want anyone in the world to have access to my home computer and printer when I authorize it. Right now, to do that I have to configure my router as well as my operating system to allow it. But what if I'm not at home? I might be on someone else's network. Now I am at their mercy to configure the router so that my computer is accessible. In all likelihood, they will refuse to help me.

[teawrecks]

You're talking about widening your attack surface as wide as physically possible (no virtual devices yet). Now you need to ensure every device that can see the internet is perfectly impenetrable. How feasible you think that is?