I was thinking of that RS statement a couple of weeks ago when I was in Porto, Portugal. Unfortunately, it was just as crowded as Lisbon- but in the opinion of all four in our travelling party, much better than Lisbon. Perhaps in some cases, we need to start looking at 3rd best.
In the case of the France, maybe Bordeaux needs to be added to the mix. There is an RS tour that includes a couple of days in the Dordogne region, but after 8 days there that included one day in Bordeaux I'm convinced a 7-10 day tour is easily doable. When I think about it, the France guidebook could easily be twice the size of he didn't narrow things down.