The things I've read so far as to why some people feel paper maps are better have to do with the route the GPS chooses. When using a paper map, you need to choose your own route and there's no guarantee you will choose any better route than the GPS.
Every GPS I have ever used lets me preview the route and most let you edit the route as you see fit. There's no reason that I can see to need a paper map.
I haven't used a paper map since 1996 when I started using a Delorme Tripmate GPS puck with AAA Map-n-Go software on a Windows 95 laptop.