Dosa is a very good item to be a very good item to be eaten only with Hands.
During my Hyderabad days, 1990 to 1994, I used to visit Kamat Hotel regularly and used to enjoy Telugu biddas ( not all! ) eating Masala Dosa with fork and knife. Great! It was fun though!
As recently as about 1.5 years before, the President of the company I worked with, clearly demonstrated about eating Dosa with Hands ( to foreigners accompanying us! ), even though he is from North India!
The right amount of coconut chutney along with a Tomata mash chutney, with podi-milagai makes it the wonderful breakfast snack on earth!
Same applies to Biriyani. You need to mix with Raitha and the Bengan Kurma, before you dig in the Hyderabadi / Moghul Biriyani. ( with hand - it brings out the better out of it ).