My very personal take (which can be completely wrong) is that few dynasties were comparable to the vastness of Mughals in this particular era. All the Indian princely states were a lot smaller by comparison, in this time period at least. One that stands out to me is The Sikh Empire 1799–1849 that managed to rule much of North India + current day Afghanistan and Pakistan but for a relatively short period of time. The British East India company were a challenging force to beat, some allied with them which stunted their own ambitions, others like the Sikh Empire lost to them eventually.
The marathas were much larger and in a lot of ways a lot more interesting than the Mughals for a variety of reasons. The fact that you believe that that Indian princely states were smaller is... Bizarre and ahistoric. England's rule over India only became a sure thing when England defeated the Marathas. Until then it was just piecemeal colonization. The fact that you are discussing the Raj without mention of the Marathas underscores the very concern that was brought up that Indian history is highly editorialized
Part of the reason is that -- in the popular Western imagining -- India really refers to the Gangetic plain. Any book on India mainly attributes Gangetic culture to 'India' whole completely ignoring the south, west, east and north east all of which have unique cultural traits.
As someone of Indian ethnicity, this was extremely confusing to me because when we read about Indian history in books and people would ask me, I would literally have no idea. My particular ethnic group lived along the coast of the western ghats and greatly valued the ocean and seafaring... Almost completely the opposite of the Gangetic peoples. This bias is prevalent everywhere because, despite these individual cultures having enough population to be a country in their own right. They are marginalized by popular history.
The Marathas, the Bengal Subah, Durrani's Afghanistan, the Hyderabad Sultanate, the Konbaung Empire, Mysore, and Thanjvur were contemporaries similar or larger in scope and size than the Sikh Empire.
And this is OP's point.
Most "India History" in the West has an extremely colonial British bias which only concentrated on Delhi and unpartitioned Punjab.
I have nothing against Mughals, they had a great impact on the subcontinent history esp during 17th century. However the center of gravity was the Indian Ocean Spice trade network which was the South. This is what the Portuguese and various EICs wanted to connect to. We have records of the vast riches of these Deccan cities from these travelers.
> few dynasties were comparable to the vastness of Mughals
The Mauryas perhaps ruled a much larger area than Mughals. Khalji, Tughlaqs, Satvahanas, and Marathas also ruled over vast landscapes, but they are not much known outside India.
https://en.wikipedia.org/wiki/Maratha_Empire#/media/File:Ind...