I think this is because a lot of fans view interviews as another segment to 'interpret' in characters, and see it as a sign the couple is meant to be together.
They definitely get along well, and have amazing scenes, but I doubt their being in interviews together would bring any kind of TRPS for the show, and they seem totally professional.Both of them usually give bytes alone, and only rarely with others, and I think that's perfectly fine, seeing how people are all too eager to put 2 and 5 together to make 10, literally.
Thanks for commenting here Geet. I am not suggesting that their interviews would bring TRP's to the show nor I am shipping them together. I am very happy with them being professional, but I thought they can still be cordial to each other and be total professional, yet give their interviews together. After all it is their show.