Just out of curiosity , is fundamental idea of India being a singular country wrong , considering its so much diverse ethnically , culturally and traditionally ?

"A person from Tamil Nadu has very few cultural similarities with someone from Haryana, just as an Odia person has little in common with a Himachali. Despite these differences, we stick together as a country, and everyone is highly interdependent at this point. No matter how much people curse each other online, very few would want complete separation (apart from some brainwashed Kashmiris who want to be controlled by China). Even parts of the Northeast insurgency mostly revolve around gaining more autonomy in the region. If we talk about religion, then with this logic, the whole of the EU should be a singular identity, but they are the biggest warmongers in modern-day history. Will we ever be separated? Over generations, people are becoming more tolerant and understanding of each other’s cultures. The only issue that arises is language. No one wants Hindi imposition, as it has already destroyed the languages in many North Indian states. Most Indian youth understand Hindi and can speak it, largely by watching cartoons and movies, but it gets difficult to read and write. What is your opinion?"