Well, you can certainly use the same pan for making Dosa, Chapati, or Paratha. But sometimes, it's better to have a dedicated tool for each delicacy. And when it comes to the dosas and other flatbreads, I'd suggest you get a separate quality pan for the dosas. If you use the same pan for them, the pan will definitely lose its non-stick quality sooner than later. As you know, the non-stick feature is necessary to remove dosas from the pan. Without this feature, it'd be really challenging to make dosas efficiently.