It is one thing to know how to cook individual Indian dishes, quite another to combine the dishes harmoniously into an appetizing meal. Rajma masala and chhole masala are fantastic house party food, but would you serve them together? Not if you have a modest number of items on the menu. You love pooris as much as you love kadhi, but you would pair them with each other? Not if you want to kill the essence of both.
There are flavors that cohere and flavors that clash. You wouldn’t put multiple items of the same genre – such as gourds or dals – in the same meal. Pooris would possibly go with potato curry, kadhi would most definitely get served with plain rice.