Could someone explain why we can’t just plug the average PC etc into a ‘raw’ internet line (like just entering a house) and have a mini modem on the motherboard do the translation work?
I know there’s a limit to IP addresses, and that it’s maybe easier to have a little box do the work where it enters a building.
… but apart from that?
There’s no modem needed, actually. All of that can be done in software, and you can configure a desktop as a PPPoE client (that’s the protocol your router uses to log into your ISP’s network and receive internet connectivity). Obviously, you’d need to configure that PC as a router for other computers to also share the connection, and running a typical interactive system 24/7 as a router is hideously inefficient in terms of power use.