Not completely redundant, but largely so. One needn't include everything in the title. Lot of people are becoming tired by "rationality" popping up from every other sentence on this website. Not only it looks cultish and fanatical, but it is suspected that people put "rationality" in their articles as an "applause light", i.e. phrases used for signalling and gaining approval with little other information value. It may be therefore a good policy to avoid "rational" whenever possible.