Gav Iscon,
It's purely interest not worry.
The one thing of interest being the continuing cooking around the rim of the dish/pan after it's served.
At the time I frequented balti my focus was far from the food. The one thing that sticks in memory (difference from BIR) was how hot the dishes were and they cooked on for some time after they were served at the table. They also produced some smoke.
The interest being how this was done when the food is cooked in the same dish. It's not an empty interest so to speak I have tried hot frying in my dishes/pans which led to the pre heating approach.