I got a new router (Asus) because my old one is getting flaky and requiring frequent reboots. My problem is, I have one desktop that connects via wifi and I can't get it to see the SSIDs of the new ...
You can do tons of stuff with a computer that most hardware NAT-routers cannot do, like having firewall software run on it, provide services (print (I know the SMC routers also have this), file, proxy ...
If this sounds like you it's time to think about an upgrade ...