The router is a single point of failure if it's what's hooked up to your modem, especially now that routers frequently come with questionable built in services

The router is a single point of failure if it's what's hooked up to your modem, especially now that routers frequently come with questionable built in services to make your shares and such available remotely and often have very questionable decisions made when it comes to their web interfaces and even basic things like password storage. Now that may be different than 'wifi,' but color me surprised if in the average home with wifi it's not emanating from a questionably configured router running questionable firmware with a direct connection to the Internet.