So if the Eagles win, why is that game not at least as difficult? Presumably this will be the best team the 49ers beat, and then have to go on the road where while they have won, not been quite as good (which is fine, all you need to do is win, and I got into a discussion the other day who someone would rather the Eagles play the 49ers for many of the reasons you've stated).
Meanwhile, Dallas is looking at a rough, physical game and still a brutal schedule. 3 games in a row is typically really difficult, this is going to be 4, I don't know if anyone's done 5 at any time since the merger. And that's not even taking into the account the Eagles had the bye and actual best record.